Ray Optics And Optical Instruments

Physics
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A beam of light consisting of red green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. The prism will:

A
separate the red colour part from the green and blue colours
B
separate the blue colour part front the red and green colours
C
separateall all three colours from one another
D
not separate the three colours at all
Hard
NEET
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An astronomical refracting telescope will have large angular magnification and high resolution, when it has an objective lens of :

A
Large focal length and large diameter
B
Small focal length and large diameter
C
Small focal length and small diameter
D
Large focal length and small diameter
Medium
NEET
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