Question

class 10th/optics.
question in attachment. :) ​

Answer 1

Answer:

b. 22.5cm

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Answer 2

option: C)

u = 60cm = - 60 cm .. rule

f = 20cm = -20 cm ..rule

At image distance should plane mirror be placed so that image in convex lense conside with plane mirror.

1/v - 1/u = 1/f

1/v = 1/f + 1/u

1/v = 1/-20 + 1/-60

1/v = (-60 - 20)/ 1200

1/v = -80/1200

1/v = -8/120 = -1/15

1/v = -1/15

Rejecting the negative values as per sign convention rule

so v = 15 cm

At 15 cm from convex mirror a plane mirror should be placed so that image in two mirrors conside.