AP EAPCET 2024 - 18th May Morning Shift | Ray Optics Question 10 | Physics

The focal length of a thin converging lens in air is 20 cm . When thefens is immersed in a liquid, it behaves like a concave lens of power 1 D . If the refractive index of the material of the lens is 1.5 . The refractive index of the liquid is

$5 / 3$

$4 / 3$

$5 / 4$

$7 / 4$

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

A needle is lying at the bottom of a water tank of height 12 cm. The apparent depth of the needle measured by a microscope is 9 cm . If the water is replaced by a liquid of refractive index of 1.5 of same height, the distance through which the microscope has to be moved to focus the needle again is

1.2 cm

1.1 cm

1 cm

1.33 cm

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

The radii of curvature of a double convex lens are 4 cm and 8 cm . If the refractive index of the material of the lens is 1.5 , the focal length of the lens is nearly.

16 cm

12.11 cm

7.33 cm

5.33 cm

AP EAPCET 2022 - 4th July Morning Shift

MCQ (Single Correct Answer)

-0

A ray is incident from a medium of refractive index 2 into a medium of refractive index 1. The critical angle is

$$30^\circ$$

$$60^\circ$$

$$45^\circ$$

$$90^\circ$$

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