ASSERTION- Sunlight reaches us without dispersion in the form of white light and not as its components. REASON- Dispersion takes place due to variation in the refractive index for different wavelength but in vacuum the speed of light is independent of wavelength and hence vacuum is non-dispersive medium.
Please answer the question giving suitable explanations.
ASSERTION- A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism. REASON- Wavelength of red light is more than other component colors and hence red light deviates least.
Pls answer the question giving suitable explanantions
ASSERTION- In case of a rainbow, light at the inner surface of the water drop gets internally reflected. REASON- The angle between the refracted ray and the normal to the drop surface is greater than the critical angle.
Pls answer the question giving suitable explanantions
Explain parts of human eye and its functions....
- A.Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true.
ASSERTION- Sunlight reaches us without dispersion in the form of white light and not as its components.REASON- Dispersion takes place due to variation in the refractive index for different wavelength but in vacuum the speed of light is independent of wavelength and hence vacuum is non-dispersive medium.
Please answer the question giving suitable explanations.
Draw a labeled diagram of human eye. Write the functions of Cornea, Iris, Pupil, eye lens and retina.
Difference between internal reflection and total internal reflection
How to solve numericals related to myopia and hypermetropia? Plz explain.
ASSERTION- A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism.
REASON- Wavelength of red light is more than other component colors and hence red light deviates least.
Pls answer the question giving suitable explanantions
What is the most sensitive part of the retina
ASSERTION- In case of a rainbow, light at the inner surface of the water drop gets internally reflected.
REASON- The angle between the refracted ray and the normal to the drop surface is greater than the critical angle.
Pls answer the question giving suitable explanantions
Why the Danger Signals are red in Colour ?
(a) Red
(b) blue
(c) white
(d) black
what is scattering of light ?
A student dissolves about 200 g of sodium thiosulphate (hypo) in about 2L of clean water
Explain the construction and working of human eye? (4 MARKS)
what is optical density?How it decreases as we move away from earth's surface?
what is power of accommodation??
why do different components of white light deviate through different angles when passing through a triangular glass prism???
Give examples of daily life where dispersion of light is seen?
what is incident ray and emergent ray ?
(a) Red light moves fastest
(b) Blue light moves faster than green light
(c) all the colours of the white light move with the same speed
(d) yellow light moves with the main speed as that of the red and the violet light
explain delayed sunset and advanced sunrise.... why does it happen( give proper reason).....
plz help.....
13. A reporter records the following observations of an astronaut from his space ship. (a) The length of the day is same as observed on the earth. (b) Sky appears black in colour. (c) The star appears to twinkle while the planets do not do so as they do on the earth. Justify each statement.
why does sun appear red during sunrise and sunset
(a) Reflection, refraction and dispersion.
(b) Refraction, dispersion and total internal reflection
(c) Refraction, dispersion and internal reflection.
(d) Dispersion, scattering and total internal reflection.
what is the function of rod and cone cells in human eye?
the ratio of real depth to apparent depth is called what and why?
what is the relation between angle of incidence ,angle of deviation ,angle of prism and angle of emergence?
why is a normal eye not able to see clearly the objects placed closer than 25 cm
the angle between two lateral faces of a triangular prism is called.....
draw a ray diagram to show the refraction of light through a glass prism .On this diagram plz mark :
a)incident ray
b)emergent ray,
c)angle of deviation
color of the object is determined by
a) the color of light reflected by it.
b) the color of light absorbed by it.
c) the color of light incident on it only.
d) the color of light transmitted by it.
guys choose the correct ans.
n plzzzzzz be faster
why does a glass slab not disperse white light ?
define angle of prism?
1. The near point of a hypermetropic person is 75 cm from the eye. What is d power of d lens required to enable him to read clearly a book held at 25 cm from the eye?
2. If the person in the previous problem uses spectacles of power +1.0 D wat is d nearest dist. of distinct vision for him?
a student dissolves about 200 g of sodium thiosulphate in about 2l of clean water in the tank and adds up about 1 to 2 ml of conc. HSO to the water
what would he observe after the source of light S is swichted on
When we enter from bright sunlight to a dark room, we cannot see initially, why?
The sun is visible to us about 2 minutes before actual sunrise and about the actual sunset.give reasons.
Explain the formation of rainbow briefly?
Q.which phenomenon is responsible for increasing the apparent length of the day by 4 minute?
is the angle of incidence equal to the angle of emergence in a glass prism(triangular) and in a glass prism?
how are angle of prism and angle of deviation related to each other?
list three problems which arise due to construction of big dams. suggest a solution for these problems.
explain structure of human eye?
These are the question's which i am doubts ... please type the answer for these questions so that it would be helpful for me....please take it as serious matter and reply for these questions ... PHYSICS:- 1) What do you mean by lateral displacement? 2) What is the cause of dispersion of light? 3) What makes bees respond to ultraviolet rays? 4) Name the liquids that keeps our eye soft? 5) Show that the mirror formula holds good for a plane mirror? 6) Why chickens stroll only during noon while they go back early in the evening? 7) What is mean by illumination ? 8) Define the scattering of light? BIOLOGY:- 1) The PH range most conductive for life of freshwater plants and animals is (i) 6.5 - 7.5 (ii) 2.0 - 3.5 (iii) 3.5 - 5.0 (iv) 9.0 - 10.5 2) What would be the advantage of exploiting resources with long term aim? 3) What is the objective of Ganga action plane? 4) Red data book provides the list of (a) Protected animals (b) Rear animals for milk (c) entrap animal (d) Both (a) & (b) 5) Write any two ways of energy flow through on ecosystem? 6) Why is pond self sustaining unit while an aquarium may not be? Justify the answer. 7) What will be the impact on ecosystem if bacteria and fungi are removed from the environment? 8) Name any two environment friendly practices? 9) What is being done to avoid ozone depletion? 10) Describe any five modes of disposal of wastes? 11) Ecology is the study of interaction of ______________ with other and their surroundings. 12) De composers are also called as __________________. 13) Water , air, light,and temp. are the examples of _____________ components. 14) Give an example of bisexual flower what is its female reproductive part known as. 15) Pollination may occur without fertilization but fertilization will not take place pollination. Give reason? 16) Define :- (i) Fragmentation (ii) Vegetative Propagation. 17) Advantages and Disadvantages of Vegetative Propagation ? 18) Explain Tissue Culture? 19) Write the differences between Binary fission and Multiple Fission in a tabular form as observed in cells of organism? 20) List any four characteristics of Good fuel? 21) List the sexual transmitted diseases (i) Bacterial infection. 22) Explain the term (i) Speciation (ii) Natural selection. 23) Explain how equal genetic contribution of male and female parents is ensured in the progeny?
solve for x
[4x-3/2x+1] - 10[2x+1/4x-3] = 3
why do we observe changes in colour of sun at sunrise,sunset and noon?
A concave mirror produces a magnification of +4 . The object is placed:
(a) at the focus
(b) between focus and centre of curvature
(c) between focus and pole
(d) beyond the centre of curvature
Also state the reason for your answer.
what 's function of aqueous humour & Vitreous humour
what is the difference between deviation and dispersion
Why do stars twinkle?
Explain why the planets do not twinkle?
Why does the Sun appear reddish early in the morning?
list the three phenomenon of light responsible for the formation of rainbow in the sky
WHY POLE STAR DID NOT APPEAR TO TWINKLE DUE TO ATMOSPHERIC REFRACTION
Why does sun appear in oval shape during sunset and sunrise? explain with the help of ray diagram.
Why does the Sun appear reddish early in the morning?
A compound lens is made of two lenses in contact having powers + 12.5D and - 2.5D. Find the focal length and power of combination.
The magnification produced by a mirror is +1. what does this mean?
Why does stars twinkle but planets do not?
What is the power of normal eye lens?
Draw a neat and label diagram of human eye and explain functions of each part of human eye.
Q. An old man cannot see objects closer than 1m from the eye clearly. Name the defectofvision he is suffering from.
Should the answer be hypermetropia or presbyopia?
Iwrote the answer as prebyopia. Ijust want a confirmation.
presbyopia is also a special kind of hypermetropia. It is old age hypermetropia. It is that defect in which an old person cannot see nearby objects dueto loss of power of accomodation of the eye. It is mentioned in the question that the man is old, so i wrote prebyopia.
How does the focal length of the eye lens change when we shift looking from a nearby object to a distant object ?
a student is studying the disperdion of white light through a prism. draw a diagram to show th position of the prism is to have top color corresponds to the colour of solution of potassium permanganate in the spectrum obtained on the screen
1. Cornea
2. Iris
3. lens
4. Pupil
5. CilliaryMuscles
6. Retina
7. Optic Nerve
"We are able to see through a transparent medium as light is transmitted through it." What does this line mean?
what is Persistence of vision?
A student has difficulty in reading the blackboard while sitting in last row. What could be defect of vision? Draw ray diagrams to illustrate this defect and its correction.
(a) The image of sun directly through convex lens.
(b) Focus the image of sun on his hand
(c) Focus the image of sun on his nylon shirt.
(d) Focus the image of sun on the wall of the room.
A lens of focal length 5 cm is being used by a student in the laboratory as a magnifying glass. His least distance of distinct vision is 25 cm. What magnification is the student getting?
In order to obtain a magnification of , -2 with a concave mirror, the object should be placed :
(a) between pole and focus
(b) between focus and centre of curvature
(c) at the centre of curvature
(d) beyond the centre of curvature.
Also state the reason of your answer.
Why do we have two eyes for vision and not just one ??
what is the difference between myopia and presbyopia?
how does rainbow form?
A ray of light undergoes total internal reflection while moving from a denser to a rarer medium . Derive the relation connecting critical angle and refractive indices of the two media .
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
draw a ray diagram of myopic eye and its rectification.
The surface of sunglasses is curved, yet their power is zero. Why?
1. Why do stars twinkle and hence why do planets do not twinkle?
2. Give reason for the following: (a) Blue colour of the sky (b) Red colour of danger signals.
3. Give reason for the following (a) White colour of clouds (b) Sun appears red at the time of sun set and sun rise.
4. Explain Tyndal Effect.
5. What is rainbow? Give the conditions for observing it. State the principle involved in the formation of rainbow.
short note on :- myopia and hypermetropia ?