Physics
Fluid-Mechanics
Easy

Question

A space t h i n space c o n v e x space l e n s space L space left parenthesis r e f r a c t i v e space i n d e x space equals 1.5 right parenthesis space i s space p l a c e d space o n space a space p l a n e space m i r r o r space M. space W h e n space a space p i n space i s
p l a c e d space a t space A comma space s u c h space t h a t space OA equals 18 cm comma space i t s space r e a l space i n v e r t e d space i m a g e space i s space f o r m e d space a t space A space i t s e l f comma space a s space s h o w n space i n space
f i g u r e. space W h e n space a space l i q u i d space o f space r e f r a c t i v e space i n d e x mu space mu subscript ell space i s space p u t space b e t w e e n space t h e space l e n s space a n d space t h e space m i r r o r comma space t h e space p i n space
h a s space t o space b e space m o v e d space t o space A apostrophe space s u c h space t h a t space OA to the power of straight prime equals 27 cm comma space t o space g e t space i t s space i n v e r t e d space r e a l space i m a g e space a t space A apostrophe space i t s e l f. space T h e space v a l u e space
o f space mu subscript ell space w i l l space b e space colon

  1. square root of 3
  2. 4 over 3
  3. 3 over 2
  4. square root of 2

The correct answer is: 4 over 3

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