A concave mirror has a focal length 12 cm. The distance between two positions of image of an object placed in front of mirror for which image size is twice the object size, is
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10 Which of the following are correct for the greenhouse effect?
(i) CO2 is mainly responsible for the greenhouse effect.
(ii) The gradual increase in the average temperature of the earth’s atmosphere is
called global warming.
(iii) Methane, nitrous oxide and water vapour are greenhouse gases like CO2.
(iv) An increase in earth’s temperature by as little as 0.5
0C has no effect.
(A) (i), (ii), (iii) (B) (ii), (iii), (iv) (C) (i), (iii), (iv) (D) (i), (ii), (iii),(iv)
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the correct answer is 48 cm pls mark me brainlest
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