Ray Optics and Optical Instruments: RE-NEET 2026

Medium· Refraction (Apparent Depth and Apparent Height)· +4 / −1

Consider three media

P

Q

and

R

with refractive indices

1

1.25

, and

1.5

respectively. The medium

Q

having a thickness of

5

cm is placed between extended media

P

and

R

as shown in the figure. An object

O

is placed at the centre of medium

Q

. If viewed from medium

P

near the normal direction, the apparent depth of

O

h_1

. For similar observation from medium

R

, the apparent depth is

h_2

. The value of

|h_1 - h_2|

, in cm, is: Figure: slab

Q

(

n_Q = 1.25

, thickness

5

cm) has medium

P

(

n_P = 1

) above it and medium

R

(

n_R = 1.5

) below it. The object

O

is at the middle of

Q

2.5

cm from each face. Question diagram

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