Question

5. An object of size 20 cm is placed perpendicular to
the principal axis of a concave márror. The distance
of the object from the mirror equals the radius of
curvature. The size of the image will be
(a) 0.5 cm
(b) 10 cm
(c) 1.5 cm
(d) 20 cm
an image for
beat​

Answer 1

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➻ Height of object = h₁ = 20 cm

➻ distance of object from concave mirror

= radius of curvature

it means

➻ position of object , u = Centre of curvature

■ We have to find the size of image

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➤When object is placed at cenre of curvature of concave mirror then

★ Image will be formed at Centre of curvature

★ Image will be real and inverted

★ Size of image will be equal to the size of object

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Therefore,

➳ size of image = size of object

➳ size of image = 20 cm

hence,

☛ Option (d) 20 cm is correct.

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