Question

An object 5cm in size is placed 30 cm in front of a concave mirror of a focal length 15 cm. Find the size and nature of image formed. Draw a ray diagram to show the image formation.​

Answer 1

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Hello

here's your answer

As per question, size of a object, h = +5 cm;

focal length of the concave mirror, f = -15 cm

and object distance, u = -30 cm

1/v + 1/u = 1/f, hence, we have

1/v = 1/f - 1/u = 1/(-15)-1/(-30)

= -1/15+1/30 = -1/30

v = -30 cm

m = h'/h = -v/u

size of the image, h' = -v/u × h

= (-30)/(-30)×5

= -5cm

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