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CBSE 10th Standard Science Subject Light Reflection and Refraction Ncert Exemplar 1 Mark Questions With Solution 2021

Published on: 26/05/2021

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Std: 10th Standard CBSE - Science

chapter: - NCERT Exemplers

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Questions:

Generic 2

5 x 2 = 10

Between which two points of a concave mirror should an object be placed to obtain a magnification of - 3?

What does negative sign in the value of magnification of a mirror indicate?

What will happen to ray of light when it travels from rarer medium to a denser medium?

A ray of light is incident on a concave mirror along its principal axis. What will be the angle of reflection?

What is meant by power of a lens?

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Answers Key:

Generic 2

5 x 2 = 10

The negative sign of magnification shows that the image is real and inverted. Hence, the object must be positioned between F and 2F.

Image is real

Bends towards the normal.

Angle of reflection = 0
Since, \(n=\frac { c }{ v } \)
we get, \(n=\frac { c }{ 0.6c } =\frac { 1 }{ 0.6 } \approx 1.67\)

It is a measure of the degree of convergence or divergence of light rays falling on it. It can also be defined as the reciprocal of its focal length in metres.