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Which of the following are not electromagnetic waves
|
(a) Cosmic rays |
(b) Gamma rays |
(c) b-rays |
(d) X-rays |
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
|
(a) |
(b) |
(c) |
(d) |
When light of wavelength λ is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then
|
(a) |
(b) |
(c) 2 |
(d) |
A convex lens has a focal length f. It is cut into two parts along the dotted line as shown in the figure. The focal length of each part will be
|
(a) |
(b) f |
(c) |
(d) 2f |
