ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari
ICSE Guess > ICSE Papers > Important Questions > Class X > 2009 > Physics > Physics By Mr. M.P.Keshari
Refraction at Plane Surfaces (Solved)
Disable Pop up Blockers to View Solution
 
Question .1. State Snell’s law of refraction.
Answer : Click Here
Question .2. The refractive index of air with respect to glass is defined as
gμa = sin i / sin r
(i) Write down a similar expression for a μ g in terms of angle i and angle r.
(ii) In (i) above, if angle r = 90º what is the corresponding angle i called ?
(iii) What is the physical significance of i in part (ii) above ?
Answer : Click Here
Question .3. What is meant by
(i) Critical angle
(ii) Total internal reflection.
Answer : Click Here
Question .4. Draw a ray diagram to illustrate how a ray of light incident obliquely on one face of a rectangular glass slab of uniform thickness emerges parallel to its original direction. Mention which pairs of angles are equal.
Answer : Click Here
Question .5. Water in a pond appears to be only three quarter of its actual depth.
(i) What property of light is responsible for this observation ?
(ii) Illustrate your answer with the help of a ray diagram.
Answer : Click Here
Question .6. (i) With the help of a well labelled diagram show that the apparent depth of an object, such as a coin, in water is less than its real depth.
(ii) How is the refractive index of water related to the real depth and the apparent depth of a column of water ?
Answer : Click Here
Question .7. Draw a ray diagram to illustrate the bending of a stick in water.
Answer : Click Here
Question .8. What is an optical fibre ? Give one practical use of an optical fibre.
Answer : Click Here
Question .9. Explain briefly what causes the twinkling of stars at night.
Answer : Click Here
Question .10. What is meant by the statement, ‘the critical angle for diamond is 24º ?’ How is the critical angle of the material related to its refractive index ?
Answer : Click Here
Question .11. A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour.
(i) Will the image of all the letters be in the same place ?
(ii) If not, state which letter will be raised to the maximum. Give a reason for your answer.
Answer : Click Here
Question .12. What is meant by refraction ?
Answer : Click Here
Question .13. Express the refractive index μ of a medium
(i) in terms of the velocity of light;
(ii) in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.
Answer : Click Here
Question .14. If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle i is not 0) ?
Answer : Click Here
Question .15. Mention two properties of a wave: one property which varies and the other which remains constant when the wave passes from one medium to another.
Answer : Click Here
Question .16. A prism deviates a monochromatic ray of light through an angle ‘δ’ when the angle of incidence on the surface of the prism is ‘i’:
(i) Draw a diagram showing the variation of ‘δ’ with ‘i’. On your graph show the angle of minimum deviation.
(ii) What is the relation between the angle of incidence and the angle of emergence when the ray suffers minimum deviation ?
Answer : Click Here
Question .17.Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism.
Answer : Click Here
Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]
|
