Concave mirrors are used in solar devices to collect heat and radiations.Heat radiations from the sun coming from infinity are brought to focus by concave mirror in its focal plane.
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Q1
Give reasons:
Concave mirrors are used in solar devices.
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Q2
Concave mirrors are used to solar energy.
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Q3
Concave mirrors in solar furnaces are used for cooking and heating?
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Q4
Give reasons:
(1) You cannot enjoy watching a movie from a very short distance from the screen in a cinema hall.
(2) A simple microscope is used by watch repairers.
(3) A concave lens is used to correct myopia.
(4) In gold age bifocal lens is necessary for some person.
(5) Concave mirrors are used in solar devices.
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Q5
Give reasons for the following Silicon voltaic cells are used in solar electrical energy devices.