MCQ
Coherent sources are obtained in the use of double prism experiment :
- Aby reflection
- ✓by refraction
- Cby interference
- Dby diffraction
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A convex mirror is used to form the image of an object. Then which of the following statements is wrong
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(a) The image lies between the pole and the focus |
|
(b) The image is diminished in size |
|
(c) The image is erect |
|
(d) The image is real |
If the potential of a capacitor having capacity of 6 mF is increased from 10 V to 20 V, then increase in its energy will be
|
(a) 12 × 10–6 J |
(b) 9 × 10–4 J |
(c) 4 × 10–6 J |
(d) 4 × 10–9 J |
The ratio of the energy of a photon with
to that with
is
|
(a) 2 |
(b) 1/4 |
(c) 4 |
(d) 1/2 |