= 1.33 Now if the water is replaced by other liquid, the apparent depth will change and microscope will have to be further moved to focus the image. With new liquid Apparent depth =
Realdepth
a
µl
⇒ Apparent depth =
12.5
1.63
= 7.67 cm Now the microscope will have to shift from its initial position to focus on the needle again which is at 7.67 cm depth. Shift distance = 9.4 – 7.67 = 1.73 cm.