[2 Mark Questions]

Questions · Page 2 of 2

Question 512 Marks

What are the characteristics of the image formed on a plane mirror?

Answer

Question 522 Marks

List down the uses of concave mirror.

Answer

Concave mirrors are used :
- As Shaving mirror.
- As Reflectors in automobile headlights & torches.
- By dentists to see large images of the teeth of patients.
- To produce heat in solar furnaces.

Question 532 Marks

A ray of light traveling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

Answer

When a ray of light travels from air into water obliquely, it bends towards the normal.
This is because water is optically denser than air.
On entering water, speed of light decreases and the light bends towards normal.

Question 542 Marks

Under what circumstances there won’t be any refraction of light when it enters from one medium to another?

Answer

When light incident at 90°, it will not bend.
When light passes from denser medium to rarer medium and if it is incident at an angle greater than the critical angle, it will reflect but will not refract.

Question 552 Marks

Two medium with refractive index 1.31 & 1.50 is given. In which case (i) Bending of light is more and (ii) speed of light is more.

Answer

(i) 1.50 – Bending is more
(ii) 1.31 – Speed is more

Question 562 Marks

Which is optically denser out of the two medium M1& M2 having the refractive indices = 1.71 and 1.36 respectively?

Answer

M1 Reason: Optical density increases as the value of the refractive index increases.

[2 Mark Questions] - Page 2 - Science STD 9 Questions - Vidyadip

Science [2 Mark Questions]