Physics-
General
Easy
Question
There is an equiconvex glass lens with radius of each face as 
and 
. If there is water 
in object space and air in image space, what is the focal length of the lens?
The correct answer is:
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A symmetrical biconcave lens having radius of curvature R is made up of two different materials as shown in figure. A parallel beam of light passing through the lens appear to diverge from two different points. Find the distance between them.
A symmetrical biconcave lens having radius of curvature R is made up of two different materials as shown in figure. A parallel beam of light passing through the lens appear to diverge from two different points. Find the distance between them.
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A thick biconvex lens 
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A thin equiconvex lens of glass of refractive index μ=3/2 filled with water 
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A transparent glass sphere of radius 
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A transparent glass sphere of radius and refractive index μ=1.5 has its one half silvered so that it acts like a concave mirror. Find the position of final image for an object ' O^' at (A) 30 and (B) 20 cm to the left of the front surface of the ball.
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A glass rod has ends as shown in figure. The refractive index of glass is 
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A hollow sphere of glass as shown in figure has refractive index and has a small mark on its interior surface which is observed from a point outside the sphere on the side opposite to the center. The inner cavity is concentric with the external surface and thickness of glass is everywhere equal to the radius of the inner surface. What is the apparent shift in the position of mark?
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