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Mona and Anushka are friends, both studying in class 12. Mona is in Science stream and Anushka in in Arts stream. Both of them go to market to purchase sunglasses. Anushka feels that any coloured glasses with fancy look are good enough. Mona tells her to look for `UV` protection glasses, polaroid glasses and photo sensitive glasses.
Read the above passage and answer the following questions :
(i) What are `UV` protection glasses, polaroid glasses and photo sensitive glasses ?
(ii) What values are displayed by Mona ?

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(i) `UV` protaction glasses are those which filter ultra-violet rays that are harmful to our eyes. Polaroid glasses help in reducing the glare. Photo-sensitive glasses get darker in strong day light. They protect our eyes from strong sunlight especially at noon.
Mona has displayed concern for her friend. She has put to use the knowledge she acquired in her science classes. Mugging up things for examination is of no use. What we are taught in class room must be used in practice.

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