light Questions and answers for Class 8

In this page we have Light Class 8 Practice Questions CBSE . Hope you like them and do not forget to like , social share and comment at the end of the page.

Fill in the blanks

(1) The ________ at the point of incidence is called the normal.
(2) __________ is a light sensitive screen
(3) When two mirrors are kept parallel to each other the number of images is _____________.
(4) Kaleidoscope works on the principle of __________.
(5) The splitting of white light into its constituent colours is called ________.
(6) The coloured part of eye is _________.
(7) The ________muscles alter the ________ of the eye lens.
(8) The normal value for a ________ is approximately 25cm.
(9) Droplets of water split sunlight to form a spectrum known as ______.
(10) ________ can be corrected by using a concave lens of suitable focal length.
(11) Refraction occurs because the ________ of light is different in different medium.
(12) When white light passes through a prism, it is __________.
(13) In a Kaleidoscope, the mirrors make an angle of _______ with each other.
(14) The English Braille system uses _________ dots.
(15) Lateral displacement takes place due to refraction in a ________.

Short Answer Questions

Question 1
What is virtual image?

Question 2
What are the characteristics of the image formed by a plane mirror?

Question 3
What is the function of a periscope in a submarine?

Question 4
Calculate the number of images formed by plane mirror kept an angle of 30o to each other?

Question 5
What is the main structural difference between a convex and a concave mirror?

Question 6
What is the aperture of a lens?

Question 7
For a proper in take of Vitamin A, what kind of food should you eat?

Question 8
What is the cause of refraction?

Question 9
Stars appear to be slightly higher in the sky than they actually are, Why is this so?

Question 10
Distinguish between near point and far point of eye?

Question 11
What are the differences between reflection and refraction of light?

Question 12
Give reasons-
(a) A concave lens is also known as a diverging lens?
(b) An object seen through a prison appears coloured.
(c) It is not possible to see an object clearly if it is kept too close to the eye?

Question 13
Distinguish between converging and diverging lens?

Question 14
Why a pencil dipped in water appear bent at the surface of water?

Practice Question

Question 1.
What do you mean by lateral inversion?

Question 2.
How will you experimentally locate the image of an object made by a plane mirror?

Question 3.
Draw a ray diagram to locate the image of an object placed 5 cm in front of a plane mirror?

Question 4.
Differentiate between regular and diffused reflection. Draw diagram to show the two types of reflection?

Question 5.
State three uses of plane mirrors

Question 6.
 What is Kaleidoscope? State the principle on which it is based?

Question 7.
Distinguish between myopia and hypermetropia?

Question 8.

Question 9.
Explain persistence of vision?

Question 10.
With the help of neat illustrations, describe the principle focus of spherical lenses?

Question 11.
How is rainbow formed?

Question 12.
What is the blind spot? where it is located?

Question 13.
Describe, giving reasons, the path of a ray of light incident on a glass slab takes till it emerges from the slab?

Question 14.
What do you mean by accommodation of the eye? What gives the eye the power of accommodation?

Question 15.
A coin kept at the bottom of a glass bowl full of water appears to be higher than it actually is? With the help of labeled diagram, explain why this happen?

Multiple Choice Questions

Question 1.
Which of the following statements is correct regarding rods and cones in the human eye?
(a) Cones are sensitive to dim light.
(b) Cones are sensitive to bright light.
(c) Rods are sensitive to bright light.
(d) Rods can sense colour.

Question 2.
Magnification produced by a plane mirror is
(b) zero
(c) +1
(d) infinity

Question 3.
The splitting of light into its component colours is termed as
(a) refraction of light
(c) diffraction of light
(d) dispertion of light

Question 4.
If the angle of incident is 30° , what will be the angle of reflection from plane mirror
(a) 30°
(b) 90°
(c) 60°
(d) 0°

Question 5.
Part of the eye which controls the light entering is called
(a) iris
(b) cornea
(c) retina
(d) lens

Question 6.
An object 10cm high is placed at a distance of 50 cm from a plane mirror .The size of the image will be.
(a) 20 cm
(b) 40cm
(c) 10cm
(d) 100cm

Question 7.
The visually impaired can also read with fingers using a special alphabet called :-
a. Bralle
b. Brialle
c. Brallie
d. Braille

Question 8.
Image formed by the plane mirror is:
(a) Always real
(b) Always virtual
(c) Sometimes real sometimes virtual
(d) None of these

Question 9.
The type of lens in Human eye is
a. Convex
b. concave
c. Mixture
d. None of these

Question 10.
The property of plane mirror to make 'right appear as left' and vice versa, is called:
(a) Vertical inversion
(b) Refraction
(c) Reflection
(d) Lateral inversion


This light class 8 questions and answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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