Select Board & Class
Explain parts of human eye and its functions....
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.
Draw a labeled diagram of human eye. Write the functions of Cornea, Iris, Pupil, eye lens and retina.
What is the most sensitive part of the retina
How to solve numericals related to myopia and hypermetropia? Plz explain.
Why the Danger Signals are red in Colour ?
what is scattering of light ?
Explain the construction and working of human eye? (4 MARKS)
what is power of accommodation??
what is the difference between deviation and dispersion
Give examples of daily life where dispersion of light is seen?
Difference between internal reflection and total internal reflection
what is incident ray and emergent ray ?
explain delayed sunset and advanced sunrise.... why does it happen( give proper reason).....
what is the difference between color blindness and night blindness? According to its pigments
why does sun appear red during sunrise and sunset
why do different components of white light deviate through different angles when passing through a triangular glass prism???
what is the function of rod and cone cells in human eye?
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 .
what is the relation between angle of incidence ,angle of deviation ,angle of prism and angle of emergence?
To a person the lines drawn parallel to one another appear distorted. Name the defect in the eye.
why is a normal eye not able to see clearly the objects placed closer than 25 cm
A person needs a lens of power -6.0dioptre for correcting his distant vision. For correcting his near vision, he needs a lens of power +2.0 dioptre. What is the focal length of the lens and its nature required for correcting (i)distant vision
draw a ray diagram to show the refraction of light through a glass prism .On this diagram plz mark :
c)angle of deviation
why does a glass slab not disperse white light ?
What is stereopsis?
define angle of prism?
arrange the rainbow colours in ascending order according to its wavelength. Also tellthe advantagelonger wavelength and shorter wavelength.
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?
the angle between two lateral faces of a triangular prism is called.....
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?
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?
Q. State one function of the crystalline lens in the human eye?
I got this answer in cbse best answers ... Is this the right answer?
Ans. Ciliary muscles in the human eye help to adjust the focal lenght of the eye lens so that the object can be focused properly and image can be formed on retina..
I THINK IT IS THE FUNCTION OF CILIARY MUSCLES.
what 's function of aqueous humour & Vitreous humour
State two properties of the image formed by the eye lens on the retina.
Why do stars twinkle?
Explain why the planets do not twinkle?
Why does the Sun appear reddish early in the morning?
A concave mirror produces a magnification of +4 . The object is placed:
(a) at the focus
(c) between focus and pole
(d) beyond the centre of curvature
Also state the reason for your answer.
list the three phenomenon of light responsible for the formation of rainbow in the sky
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?
calculate the resistance of 100 m long copper wire of radius 0.5 mm.resistivity of the copper is 1.72 x 10-8 ohmm
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.
How does the focal length of the eye lens change when we shift looking from a nearby object to a distant object ?
a short sighted person can see most clearly at a distance of 15 cm,acquires spectacles enabling him to see most clearly objects at a distance of 60 cm. calculate the total length of the lens and power of the lens
Why is image formed in front of Retina in a myopic eye, not behind it?
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 boy uses a spectacles of focal length -60 cm. Name the defect of vision he is suffering from. Which lens is used for correction of its defect ? Compute the power of this lens.
please someone answer my question.
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?
Why do we have two eyes for vision and not just one ??
what is the difference between myopia and presbyopia?
how does rainbow form?
"We are able to see through a transparent medium as light is transmitted through it." What does this line mean?
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
a doctor has prescribed a corrective lens of power -1.2 To a person suffering from myopia.
1) identify the defect from which he is suffering
2) Find the focal length of the lens
3. is the prescribed lens converging or diverging? show the nature of lens with diagram
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 ?
Copyright © 2021 Aakash EduTech Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)