A concave mirror gives an image three times as large as its object placed at a distance of 20 cm from it. For the image to be real, the focal length should be (a) 10 cm (c) 20 cm (b) 15 cm (d) 30 cm

 

 Question:  From NCERT  | NEET   || [Difficult level:Easy] Subtopic:Image Formation by Spherical Mirrors || 

:A concave mirror gives an image three times as

large as its object placed at a distance of 20 cm

from it. For the image to be real, the focal length

should be

(a) 10 cm

(c) 20 cm

(b) 15 cm

(d) 30 cm

Answer: (b) 15 cm.

......

👀NCERT Important

:Related Question:

A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is:

A

5 cm

B

12 cm

C

10 cm

D

20 cm

:

:

:

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