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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