There is a plane mirror at the bottom of tank filled with water having refractive index 4//3. A point object is placed at a height 10 cm above the bottom. What will be the apparent distance between point object and its image in plane mirror as observed by an observer outside the liquid in air ? Line joining observer and object is normal to the surface of water.

There is a plane mirror at the bottom of tank filled with water having

1.	There is a plane mirror at the bottom of tank filled with water having refractive index 4//3. A point object is placed at a height 10 cm above the bottom. What will be the apparent distance between point object and its image in plane mirror as observed by an observer outside the liquid in air ? Line joining observer and object is normal to the surface of water.
Answer» 10 cm 15 cm 20 cm 25cm Solution :Image of the object formed by plane MIRROR is at the same distance from mirror as that of object. Hence distance between object and its image in mirror is 20 cm. For an observer located OUTSIDE the liquid, APPARENT distance between them becomes `("ACTUAL distance")/(MU)=(20)/(4//3)=15 cm` Hence, option (b) is correct.

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