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Wave Optics · Question 37

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of

  1. 106 rad
  2. 10-2 rad
  3. 10-4 rad
  4. 10-6 rad.

Answer

(4) 10-6 rad.

Solution

Limit of resolution (smallest angular separation that can be resolved) of a telescope:

= 1.22 D

Here = 5000 A = 5000 10-10 m = 5 10-7 m and D = 10 cm = 0.1 m

= 1.22 5 10-70.1

= 6.1 10-6 rad

The angular resolution is of the order of 10-6 rad.

Answer: (4)

AIPMT 2005

Keep practising — Wave Optics

2

A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometer from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 A, is of the order of

  1. 0.5 m
  2. 5 m
  3. 5 mm
  4. 5 cm
AIPMT 2004
3

Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 metre from the eye? The wavelength of light is 5000 Å.

  1. 2.32 m
  2. 4.28 mm
  3. 1.25 cm
  4. 12.48 cm
AIPMT 2002

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