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After reflection, the light rays from a ...

After reflection, the light rays from a point object at the focus of a concave mirror,

A

emerge perpendicular to the principal axis.

B

emerge parallel to the principal axis.

C

form real image.

D

Both (b) and (c)

Text Solution

Verified by Experts

The correct Answer is:
D
When light rays pass through the focus of a concave mirror, the reflected rays emerge parallel to the principal axis.
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The light rays from a point object placed at the focus of a concave mirror, after reflection

(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?