Question

30. (a) To construct a ray diagram we use two rays which are so chosen that it is easy to know their
directions after reflection from the mirror. List two such rays and state the path of these rays after
reflection in case of concave mirrors. Use these two rays and draw ray diagram to locate the image of
an object placed between pole and focus of a concave mirror.
(b) A concave mirror produces three times magnified image on a screen. If the object is placed 20 cm
in front of the mirror, how far is the screen from the object?
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Answer 1

Q.)To construct a ray diagram we use two rays of light which are so chosen that it is easy to determine their directions after reflection from the mirror. Choose these two rays and state the path of these rays after reflection from a concave mirror. Use thes

Answer

The two rays chosen to construct a ray diagram are shown in the ray diagram given below.

(i) Ray I: When the incident ray is parallel to the principal axis, the reflected ray will pass through the focus of concave mirror.

(ii) Ray II: When the incident ray passes through or appears to pass through the centre of curvature, the light, after reflection from the spherical mirror, reflects back along the same path.

The image formed is real, inverted and magnified. It is formed beyond the centre of curvature.

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Answer 2

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The two rays chosen to construct a ray diagram are shown in the ray diagram given below.

(i) Ray I: When the incident ray is parallel to the principal axis, the reflected ray will pass through the focus of concave mirror.

(ii) Ray II: When the incident ray passes through or appears to pass through the centre of curvature, the light, after reflection from the spherical mirror, reflects back along the same path.

The image formed is real, inverted and magnified. It is formed beyond the centre of curvature.