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write 3 difference between concave and convex lens?
write 3 differences between real and virtual images?
What is meant by lateral displacement?
An object is placed at a distance of 25cm away from a converging mirror of focal length 20cm. Discuss the effect on the nature and position of the image if the position of the object changes from 25cm to 15cm. Justify your answerwithoutusing mirror formula.
What is the meaning of virtual and erect image???
derivation of mirror formula as well as lens formula ?
define power of lens and gives its S.I.unit
State the Principle of reversibility of light
explain..why a pencil partly immersed in water appears to be bent at the water surface
what is tyndall effect?
Q: In the experiment to trace the path of a ray of light through a rectangular glass slab using pins P1, P2, P3 and P4 four students did the following.
A) Kept the eyes far from the glass slab while placing both pins P3 and P4.
B) Kept the eyes close to the glass slab while placing both the pins P3 and P4.
C) Kept the eyes far to the glass slab while placing pin P3 and close to the glass slab when placing pin P4.
D) Kept the eyes close to the glass slab while placing the pin P3 and far from the glass slab while placing pin P4.
The correct procedure is that of the student?
A) A B)B C)C D)D
define absolute refractive index of a medium.?
WHAT IS VIRTUAL AND ERECT IMAGE
One half of a convex lens is covered with a black paper.will such a lens produce an image of the complete object?support your answer with a ray diagram.
plz ans. fast as i hv a revision test on monday
write 3 differences between reflection and refraction
The speed of light in transparent medium is 0.6 times that of its speed in vacuum.what is the refractive index of the medium ?
an object is placed at a distance of 10 cm from a convex mirror of focal length 15cm. find the position and nature of the image.
refractive index of glass with respect to air is 3/2..refractive index of water with respect to air is 4/3..what is the refractive index of glass with respect to water?? is it 3/2 divided by4/3 or 4/3 divided by 3/2??
a student focused the image of the candle flame on a white screen using a convex lens .He noted down the positions of the candle flame , screen and the lens as given below
position of candle flame = 12 cm
position of the lens= 50 cm
position of the screen = 88cm
Q 1 find the focal length of the convex lens.
Q 2 Find the position of the image of the candle flame if it is shifted towards the lens at a position of 31cm
Q3 State the nature of the image formned if the candle flame is further shifetd towards the lens..
this is a 10th board question n i m nt able 2 solve it plz helppppp
the history of spherical mirrors in human civilization
A man who wears glasses f power +3D must hold a book at least 25 cm away to see the print clearly. How far away would the newspaper have to be if he took off the glasses and still wanted clear vision?
I want no links! Give me just the answer.
What will happen to the focal length if the convex lens is dip inside the water.
the refractive index of diamond is 2.42 what is the meaning of this statement?
A double convex air bubble in water will act like a
1. convex lens
2. concave lens
3. plane slab
4. concave mirror
please explain the answer.
what is a focal length of plane mirror
Q1. A concave lens has focal length 20cm.At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens?Also calculate the size of theimage formed.
Q2. A convex lens has a focal length of 30 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 60 cm on the other side of the lens?. Find the magnification produced by the lens in this case.
using the lens formula and sign conventions for refraction by spherical lenses find the position nature and magnification of the image formed by a convex lens of focal length 20cm when object is placed at a distance of 18cm from the lens
Name the type of mirror used in the following situations.
of a car
mirror of a vehicle
your answer with reason.
What happens when a light ray is incident normally to the interface of two media.
a concave mirror produces 3 times enlarged image of an object placed at 10 cm in front of it.Calculate radius of curvature of mirror
state snells law of refraction.
Define principal focus of a lens ?
Derive lens formula, that is 1/v - 1/u = 1/f
The magnification m of an image formed by a spherical mirror is negative . it means the image is a) smaller than the object b) larger than the objectc) erect d) inverted
The magnification m of an image formed by a spherical mirror is negative . it means the image is
a) smaller than the object
b) larger than the object
c) erect d) inverted
what will be your observation,when an object placed in front of concave mirror,is moving towards the pole of the mirror?
The refractive index of water is 4/3 and for glass is 3/2 w.r.t air. What is the refractive index of glass w.r.t. water?
Between which two points related to a concave mirror should an object be placed to obtain on a screen an image twice the size of the object.
define principal focus of a Convex lens and Concave lens
the refractive index of medium x with respect to y is 2/3 and the refractive index of edium y with respect to z is 4/3. Calculate refractive index of z with respect to x?
define the principal focus of a convex mirror
What is tyndall effect?Explain an example
A concave mirror produces three times magnified real image of an object placed 10 cm in front of it.Where is the image located
Name the component of white light that deviates the least n the most while passing through a prism.
An object is kept at a dist. of 5cm in front of a convex mirror of focal length 10cm.Calculate the position and nature of the image formed.
DEFINE RARER & DENSER MEDIUM.
why a convex mirror is used as rear view mirror
how do optical fibers transmit light without absorption? mention one practical application of optical fibers.
A student focussed the image of a candle flame
An object of 7cm height is placed at a distance of 12 cm from a convex lens of focal length 8cm.
When an object is placed at a distance of 50 cm from a concave mirror , the magnification produced is - 1/2 . where should the object be placed to get a magnification of -1/5
The magnification produced by a plane mirror is +1. What does this
What is the difference between radius of curvature and centre of curvature?
a convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image size is equal to the object size. Also find the power of the lens
The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2x 108ms-1, find the speed of light in
Snell's law states that
u(constant of refraction) = sini/sinr
If a ray of light is passing through a glass slab through its normal, then sin i = 0 and thus the constant of refraction is not mantained.
But as the definition of snell's law suggests that this law is applicable to light travelling obliquely. If this is so, I have a question:
Refraction occurs due to the change in velocity of light in 2 different mediums. This change in velocity occurs as the atoms in a particular media has a specific frequency and if the light wave has a different frequecy, only then will it let the light pass through. But in this process, the light is refracted at some angle. BUT WHY DOES THIS REFRACTION NOT OCCUR WHEN LIGHT TRAVELS THROUGH THE NORMAL?
(I hope you understand the question. If not, pls tell me where I am not clear, i'll try to explain in a better way)
what r the properties of convex and concave mirror???
Find the focal length of a convex spherical mirror which produces an image 1/6th the size of an object located 0.12 m from the mirror.
Define power of lens.In what SI unit is power of lenses rated?A convex lens has a focal length of 50cm.calculate its power.
find the position of an object when placed in front of a concave mirror of focal length 20 cm produces a virtual image,which is twice size of object.
The magnification produced by a mirror is 1/3 then the type of mirror is --------------. Explain why?
an object is kept at a distance of 18cm,20cm,22cm,30cm,from lens of power +5D.
(i)in which case would you get a magnified image.
(ii)which magnified imagecan be get on the screen
why danger signals are made of red colours
A STUDENT OBTAINS A BLURRED IMAGE OF AN OBJECT ON A SCREEN BY USING CONCAVE MIRROR. IN ORDER TO OBTAIN A SHARP IMAGE ON THE SCREEN, WHERE HE WILL HAVE TO SHIFT THE MIRROR?
5 cm in length is held 25 cm away from a converging lens of focal
length 10 cm. Draw the ray diagram and find the position, size and
the nature of the image formed.
A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum. Explain why is it so.
The absolute refractive indices of glass and water are 1.5 and 1.33 respectively. In which medium does light travel faster? Calcute the ratio of speeds of light in thw two media?
When an object is placed 20cm from a concave mirror , a real image magnified three times is formed. Find:
(a) focal length of the mirror.
(b) where must the object be placed to give a virtual image three times the height of the object?
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