Light Test

Result

Light Test - 1

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

If the angle between the incident ray and the reflected ray is 100°, then the angle made by the reflected ray with normal is

A
40°

B
50°

C
60°

D
30°

Solution

Angle between the incident beam and the reflected ray is 100° (two times the angle of incidence (or angle of reflection)) so the angle of refraction is 50°.
Question 2
1 / -0

If you are standing in front of a plain mirror and find your image at a distance of 20 cm from yourself, then the distance between you and the mirror is

A
20 cm

B
10 cm

C
5 cm

D
40 cm

Solution

Distance of the object from mirror(u) = distance of the image from the mirror (v), so the distance between the object and its image is 2u (= 2v)
Here 2u = 20 cm .
Hence u = 10 cm.
Question 3
1 / -0

Read the following statements and choose the correct option:

Statement A: A ray of light incident normally will retrace its path.
Statement B: The angle of incidence and the angle of reflection both are zero.

A
Both statements A and B are correct and B is the correct explanation of A.

B
Both statements A and B are correct, but B is an incorrect explanation of A.

C
Statement A is correct, but statement B is incorrect.

D
Both statements A and B are incorrect.

Solution

In case of reflection, the angle of reflection is always equal to the angle of reflection so when a ray light is incident normally, angle of incidence is zero hence the angle of reflection is also so we can say that when a ray of light incident normally will retrace its path.

Both statements A and B are correct and B is the correct explanation of A.