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Ray Optics and Optical Instruments

JEE Main 2024 (Online) 29th January Evening ShiftMCQMedium📈 Topic in 21% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be:

  1. -10 cm
  2. -12 cm
  3. 15 cm
  4. 10/3 cm

Answer

(1) -10 cm

Solution

Magnified virtual image concave mirror, image behind the mirror.

Let u=-x; m=- vu=+2 v=+2x

Object–image distance: x+2x=15 x=5 cm

u=-5 cm, v=+10 cm

1f= 1v+ 1u= 110- 15=- 110

f=-10 cm

Only a concave mirror (object within f) gives an erect, magnified virtual image.

Answer: (1)

Keep practising — Ray Optics and Optical Instruments

Ques. 2JEE Main 2024, 27 January (Morning Shift)

If the refractive index of the material of a prism is ( A2 ), where A is the angle of prism then the angle of minimum deviation will be

  1. - 2A
  2. 2-2A
  3. - A
  4. 2-A
Ques. 3JEE Main 2024, 27 January (Morning Shift)

Two immiscible liquids of refractive indices 85 and 32 respectively are put in a beaker as shown in the figure. The height of each column is 6 cm. A coin is placed at the bottom of the beaker. For near normal vision, the apparent depth of the coin is 4 cm. The value of is . [figure]

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