- ✓Dimagnetic
- BParamagnetic
- CFerromagnetic
- DNon-magnetic
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A zone plate of focal length 60 cm, behaves as a convex lens, If wavelength of incident light is 6000, then radius of first half period zone will be
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(a) 36 |
(b) 6 |
(c) |
(d) 6 |
What is the area of the plates of a 3F parallel plate capacitor, if the separation between the plates is 5mm
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(a) 1.694 |
(b) 4.529 |
(c) 9.281 |
(d) 12.981 |
A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that
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(a) The intensity is reduced down to zero and remains zero |
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(b) The intensity reduces down some what and rises again |
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(c) There is no change in intensity |
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(d) The intensity gradually reduces to zero and then again increases |
The S.I. unit of electric flux is
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(a) Weber |
(b) Newton per coulomb |
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(c) Volt × metre |
(d) Joule per coulomb |
The phenomenon due to which a ray of light .......... from its path while travelling from one optical medium to another optical medium is called refraction.
64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be
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(a) 2q |
(b) 4q |
(c) 16q |
(d) 64q |