v31

A

0.4 cm

B

0.2 m

C

0.1m

D

0.75 m

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(f) = (2)/(f_(lens)) + (1)/(f_("mirror"))`
`rArr (1)/(f) = (2(n-1))/(R ) + 0 rArr " " f = (R )/(2(1.5 -1))`
`rArr r = 2 xx 0.2xx0.5 = 0.2` m.
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