Question

an object 1 centimetre in height is placed at 20 cm from the convex lens inverted image to CM in height is formed at 40 cm from the lens draw to draw to the scale ray diagram and calculate its focal length be magnification produced by the lens​

Answer 1

Explanation:

=> Here, an object 1 cm in height is placed at 20cm from a concave mirror and a real inverted image is formed at 40 cm from the mirror.

Thus, distance of Object, u = -20 cm

distance of Image, v = -40 cm

height of object = 1 cm

focal length = ?

=> For focal length, According to mirror formula:

1/f = 1/u + 1/v

1/f = 1/-20 + 1/-40

1/f = -2-1/40

1/f = -3/40

f = -(40/3)

f = -13.33 cm

=> Magnification produced by the mirror:

m = -v/u = - (-40/-20)

= - 2

Thus, focal length and magnification produced by the mirror for an object is -13.33 cm and -2 respectively.

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