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What is a zoom lens?
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A lens allowing a camera to change smoothly from a long shot to a close-up or vice versa
8 years ago
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UPSC Other Question
Statements:
H @ I, I # L, L ÚA, A $ Q
Conclusions:
I.H # L
II.HÚL
III.Q # H)
What is the difference between a CFL and an LED lamp? [UPSC 2011 (CS-P)]
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?