ICSE Class 10th Science Chapter 4 - Refraction of light at plane surfaces Important Questions with Answers

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A monochromatic ray of light is incident on an equilateral prism placed at minimum deviation position with an angle of incidence 45° as shown in the diagram?

Copy the diagram and complete the path of the ray PQ.
State two factors on which the angle of deviation depends.

Question 2.

White light is dispersed by a prism. Inside the prism, compared to the blue light, the red light ______.

slows down less and refracts more

slows down more and refracts less

slows down more and refracts more

slows down less and refracts less

Question 3.

An endoscope uses optic fiber to transmit high resolution images of internal organs without loss of information. The principle of light that is used by the optic fiber is based on ______.

refraction

reflection

scattering

total internal reflection

Question 4.

Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?

Question 5.

State two differences between normal reflection and total internal reflection.

Question 6.

O is a luminescent particle trapped inside a glass block. A student traces the path of rays coming out of it and reflecting over a plane mirror as shown in the diagram below.

Complete the table, using the labels from the figure. The first label is done for you.

Sr. No.	Description	Label
a.	An angle of reflection on the mirror	a
b.	A partially reflected ray in the glass slab
c.	A critical angle
d.	A refracted ray
e.	An angle of refraction of the ray R

Question 7.

Define absolute refractive index of a medium.

Question 8.

How is the refractive index of a material related to real and apparent depth?

Question 9.

State the conditions required for total internal reflection of light to take place

Question 10.

Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation

Question 1.

A ray of light travels from water to air as shown in the diagram given below :

1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.

2) State the condition so that internal reflection occurs in the above diagram.

Question 2.

A boy uses the blue colour of light to find the refractive index of glass. He then repeats the experiment using the red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Question 3.

Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary.