IIT JEE Questions And Answers :: Ray Optics And Optical Instruments: part1



IIT JEE : Ray Optics And Optical Instruments QUESTIONS AND ANSWERS :: part1 : 21 to 25

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

21.Convergence of concave mirror can be decreased by dipping in:

water
oil
both A and B
none of these

22.The images of clouds and trees in water are always less brighter than in reality:

because water is making the image dirty
because there is an optical illusion due to which the image appears to be less bright
because only a portion of the incident light is reflected and quite a large portion goes mid water
because air above the surface of water contains a lot of moisture

23.Which mirror should a boy use, if he stands straight infornt of a mirror at a distance of 30 cm away from it and sees his erect image height is 1/6th of his real height, is:

plane mirror
convex mirror
concave mirror
plano-convex mirror

24.Consider telecommunication through optical fibres. Which of the following statements is not true?

Optical fibres can be of graded refractive index
Optical fibres are subjected to electromagnetic interference from outside
Optical fibres have extremely low transmission loss
Optical fibres may have homogeneous core with a suitable cladding

25.The spectrum of molecular form of the substance is called:

band spectrum
line spectrum
absorption spectrum
continuous spectrum

More Ray Optics And Optical Instruments QUESTIONS AND ANSWERS available in next pages

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