The focal length of a diverging lens is 50 cm. The power of the lens is?
A-5 D
B-2 D
C5D
D2 D
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റേഡിയോ ആക്ടിവിറ്റി കണ്ടെത്തിയത് ?
Which of the following statements are correct?
- (a). For a lens the first principal focus is the position of the object whose image is at infinity
- (b) For a lens the first principal focus is the position of the object whose image is formed at twice the focal length.
- (c) For a lens the second principal focus is the position of the real image whose object is at infinity
- (d) For a lens the second principal focus is the position of the object whose image is formed at twice the focal length
A magnet, when moved near a coil, produces an induced potential difference in the coil, What happens when we increase the speed of the magnet near the coil?
Which of the following statements is are true for a number of resistors connected in parallel combination?
- (1) All the resistors are connected between two given points.
- (ii) The equivalent resistance of the circuit is more than the individual resistance.
- (iii) The potential difference across each resistor is same.