wave-optics Question 40
Question: Q. 1. (a) Define resolving power of a telescope. Write the factors on which it depends.
(b) A telescope resolves whereas a microscope magnifies. Justify the statement.
[SQP 2018-19]
Show Answer
Solution:
Ans. (a) Resolving power of a telescope is the reciprocal of the smallest angular separation between the two objects which can be just distinctly seen.
Factors : diameter of the objective, wavelength of the incident light.
[CBSE Marking Scheme 2018]
Commonly Made Error
- Students sometimes do not label the graph or labelled incorrectly.
AI Q. 2. (i) State law of Malus.
(ii) Draw a graph showing the variation of intensity (I) of polarized light transmitted by an analyser with angle
(iii) What is the value of refractive index of a medium of polarizing angle
R [Delhi I, II, III 2016]
Ans. (i) When the pass axis of a polaroid makes an angle
(ii)
(iii)
[CBSE Marking Scheme 2016]
Commonly Made Error
- Sometimes students did not mention the direction of propagation of light.
