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PHYSICS HOMEWORK XI-FOR FRIDAY 22ND DECEMBER 2017

SET 1
1. Would you have more sugar of 1 kg at the poles or at the equator?
2. If the force of gravity acts on all bodies in proportion to their masses, why does not a heavy body fall faster than a light body?
3. What is centripetal force? Obtain an expression for it.
4. What is acceleration due to gravity? Explain the variation of g due to height and depth.
5. Find the refractive index of a prism in terms of minimum deviation and angle of prism.
6. What are the conditions for minimum deviation of a prism?
7. At what condition a body becomes weightless at the equator?
8. Why an astronaut in a space capsule orbiting the earth feels weightlessness?
9. Why are roads banked on curved path?
10.What is centripetal force? Obtain an expression for it.

SET 2
1.  A narrow beam of light is incident normally on one face of an equilateral prism (refractive index 1.45) and finally emerges from the prism. The prism is now surrounded by water (refractive index 1.33). What is the angle between the directions of the emergent beam in two cases?
2.  A certain prism is found to produce a minimum deviation of 51⁰, while it produces a deviation of 62⁰ 48’ for two values of the angle of incidence namely 40⁰ 6’ and 82⁰ 42’ respectively. Determine the refracting angle of the prism, the angle of incidence at minimum deviation and the refractive index of the material of the prism.
3.  Which of blue and red light will be deviated more by a prism and why?
4.  On what factors the deviation produced by a prism depend?
5.  What is the condition for minimum deviation when a ray passes through a prism?

SET 3
1.  What is grazing incidence and grazing emergence?
2.  Does the angle of deviation of a small angled prism depend on angle of incidence?
3..  What is the apparent position of an object below a rectangular block of glass 6 cm thick if a layer of water 4 cm thick is on the top of the glass?
4.  A ray of light is incident at an angle of 60° on one of a glass plate 4 cm thick. Find the lateral displacement between the incident ray and the emergent ray.
5.  Light from a luminous point on the lower face of a rectangular glass slab 2 cm thick, strikes the upper face and the totally reflected rays outline a circle of 3.2 cm radius on the lower face. What is the refractive index of the glass?

SET 4
1.  Under what condition does a concave lens form a real image?
2.  Sun glasses have curved surfaces. But their power is zero. Why?
3.  What is acceleration due to gravity? Explain the variation of g due to height and depth.
4.  Find the refractive index of a prism in terms of minimum deviation and angle of prism.
5.  If the force of gravity acts on all bodies in proportion to their masses, why does not a heavy body fall faster than a light body?


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