A convergent lens with a focal length of f = 10 cm is cut into two halves that are then moved apart to a distance of d =0.5 mm (a double lens). Find the fringe width on screen at a distance of 60 cm behind the lens if a pont source of monochromatic light `(lambda=5000Å)` is placed in front of the lens at a distance of a = 15 cm from it.
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In `n^(th)` second of the motion, the distance moved by the body is three times the distance moved in the previous second. The motion is uniformly acc
Correct Answer - 2 `S_(n)=u+(1)/(2)a(2n-1)` `S_(n-1)=u+(1)/(2)a(2(n-1)-1)` `S_(n-3)S_(n-1)implies(1)/(2)a(2n-1)=3xx(1)/(2)a(2n-3)` `2n-1=6n-9` `4n=8` n=2
2 Answers 1 views
A conducting sphere of radius R is cut into two equal halves which are held pressed together by a stiff spring inside the sphere. (a) Find the change
Correct Answer - (a). `F=(Q^(2))/(32pi epsilon_(0)R^(2))` (b). `F=(piepsilon_(0)E_(0)^(2)R^(2))/(2)`
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An eye-piece consists of a concave lens of focal length 2f and a convex lens of focal length 3f separted by a distance `(f)/(2)`. They are of the same
Correct Answer - Free from chromatic aberration but not spherical, yes
2 Answers 1 views
Two thin converging lenses of focal length `0.05`m are separted by a distance of `0.03`m. Find the focal length of the eye-piece and determine wheathe
Correct Answer - `0.036`m , positive, no
2 Answers 1 views
The focal lengths of a thin convergent lens are 0.20m and 0.21m for voilet and red lights, respectively, An object is placed at a distance of 0.15m. C
Correct Answer - 0.075m
2 Answers 1 views
An object is placed `12 cm` to the left of a diverging lens of focal length `-6.0 cm.` A converging lens with a focal length of `12.0 cm` is placed at
Correct Answer - 8 cm
2 Answers 1 views
A lens of diameter `5.0cm` and focal length `f = 25.0 cm` was cut along the diameter into two identical halves. In the process, the layer of the lens
Correct Answer - `[1.5 xx 10^(-4)m,13]`
2 Answers 1 views
The two surfaces of a double concave lens are of curvature 10 cm and 40 cm. Find the focal length of the lens in water. The refractive index of water
Correct Answer - `-64 cm`
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A compound lens has been formed by joinined a convex and a concave lens, each of focal length 30 cm. what is the focal length of the combination? What
Correct Answer - Infinite, zero
2 Answers 1 views
Find the focal length and power of a convex lens, which when placed in contact with a concave lens of focal length `25 cm` forms a real image `5` time
Correct Answer - 10 cm, 10D
2 Answers 1 views