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Solution


Q.

A simple telescope used to view distant objects has eyepiece and objective lens of focal lengths fe and fo, respectively. Then                    [2006]

  Column I   Column II
(A) Intensity of light received by lens (p) Radius of aperture
(B) Angular magnification (q) Dispersion of lens
(C) Length of telescope (r) Focal length of objective lens and eyepiece lens
(D) Sharpness of image (s) Spherical aberration

 
1 (A) → (p); (B) → (r); (C) → (r); (D) → (p), (q), (r)  
2 (A) → (p), (q), (r); (B) → (r); (C) → (r); (D) → (p)  
3 (A) → (p), (q), (r); (B) → (p); (C) → (r); (D) → (r)  
4 (A) → (p), (q), (r); (B) → (r); (C) → (p); (D) → (r)  

Ans.

(1)

(A) More the radius of aperture, more is the amount of light entering the telescope.

(B) Angular magnification, M=fofe

(C) Length of telescope, L=fo+fe

Sharpness of image depends on dispersion of lens, spherical aberration and radius of aperture.