Question

PHYSICS - IX PART - 1
OPTICS
A beam of white light is incident on a hollow
glass prism. Then the light emerging from the prism gives
a) a spectrum with all colours bent away from the base.
b) a spectrum with all colours bent towards the base such that violet most and red least
c) a spectrum with all colours bent towards the base such that violet least and red most
d) no spectrum
A monochromatic ray of light after passing through the prism produces
a) seven colours only b) five colours only c) two colours only d) one colour only
5. For a ray of light incident on a prism of angle A, the wrong statement is
a) The angle of deviation will increase as A is increased
b) The angle of deviation will increase as the refractive index of the prism is increased.
c) The angle of deviation for violet colour is more than the angle of deviation for red colour
d) All colours into which the ray is dispersed emerges as a parallel beam.
In the study of the spectrum, the prism is placed in minimum deviation position to make the spectrum
a) visible
b) magnified
c) line spectrum d) well defined
A prism is placed in water. The angle of minimum deviation
a) increases
b) decreases
c) remains same d) Changes
For a given prism the angle of incidence is changed from 0 and 90°, the angle of deviation !
b) decreases
a) increases
c) first decreases and then increases
d) first increases and then decreases




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Answer 1

Answer:

Explanation:

he light emerging from prism gives spectrum but the bending of all colours is always from base

the light emerging from prism gives spectrum, all the colours bend towards the base, the violet must and red and least

the light emerging from prism gives spectrum, all the colours bend towards base, the red the least and violet the most

the light emerging from prism gives no spectrum

Answer :

D

Answer 2

Answer:

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