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Syllabus

(i) Copy the diagram and show in the diagram the path of the ray of light after it strikes the mirror and re-enters the medium of air.

(ii) Mark in your diagram the two angles on the surface of separation when the ray of light moves out from the liquid to air.

Q(b). For the incident ray LM shown, complete the diagram to show the path of the ray into and out of the prism. The critical angle of glass is 42°.

(i) In each diagram, label the incident, refracted, emergent rays and the angle of deviation.

(ii) In what way the direction of emergent ray in the two cases differ with respect to the incident ray? Explain your answer.

d) (i) Why is the ratio of the velocities of light of wavelengths 4000 A and 8000 A in vacuum 1:1 ?

(ii) which of the above wavelengths has a higher frequency ?

Explain,howObserving the types of images and measuring the object distance and image distance from the lens

(i) Copy and complete the ray diagram to show the formation of the image of the object AB

(ii) Name the lens LL'.

(iii) Name a device in which this principle is used.

Q.4. A prism deviates a monochromatic ray of light through an angle $\delta $, when the angle of incidence at the surface of the prism is i.

(i) Draw a graph showing the variation of $\delta $ 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?

Q.5. Draw a labeled ray diagram to illustrate

(i) Critical angle

(ii) Total internal reflection, for a ray of light moving from one medium to another.

Find the distance of position A and B of the object from the optic centre and the focal length of the lens.

Q.7. A light ray incident obliquely, passes into three media as shown in figure. The refractive index of medium 3 with respect to medium 1 is

(1) $\frac{\sqrt{3}}{2}$

(2) $\frac{1}{2}$

(3) $\sqrt{3}$

(4) 2

(i) In each diagram, label the incident, refracted, emergent rays and the angle of deviation.

12. If a person moves towards a plane mirror with speed of 2 m/s, with what speed is he moving towards the the image?

13. An object at a distance 25cm in front of a plane mirror. The mirror is shifted 5cm away from the object. Find :

(i) The new distance between the object and the image

(ii) The distance between the two positions of the image.

14. A man is standing 5m from a mirror. How far is he from his own image ?

Q.(b) The refractive index of air with respect to glass is, ${g}^{{\mu}^{\alpha}}=\frac{\mathrm{sin}i}{\mathrm{sin}r}$

(i) Write the expression for ${\alpha}^{{\mu}^{g}}$ in terms of angles i and r.

(ii) In (i) above, if angle r = 90$\xb0$, what is the corresponding angle i called.

(iii) What is the physical significance of angle i in part (ii) above?

(b) An object of height 4 cm is placed at a distance of 24 cm in front of a convex lens of focal length 8 cm.

(i) Find the position and size of the image.

(ii) State the characteristics of he image.

(c) In the ray diagram given below, PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS and NN' is the normal at the point Q.

As fast as you can!!!!

Q.i) If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?

Q.ii) If white light is used in the same way as in (i) above, what change is expected in the emergent of beam?

$Q5.Astudentfocussestheimageofawellilluminateddis\mathrm{tan}tobjectonascreen\phantom{\rule{0ex}{0ex}}u\mathrm{sin}gaconvexlens.Afterthathegraduallymovestheobjecttowardsthelensand\phantom{\rule{0ex}{0ex}}eachtimefocussesitsimageonthescreenbyadjustingthelens.\phantom{\rule{0ex}{0ex}}\left(i\right)Inwhichdirection,towardsthescreenorawayfromthescreen,doeshe\phantom{\rule{0ex}{0ex}}movethelens?\phantom{\rule{0ex}{0ex}}\left(ii\right)Whathappenstothesizeoftheimage?Doesitdecreseorincrase?\phantom{\rule{0ex}{0ex}}\left(iii\right)Whathappenstotheimageonthescreenwhenhemovestheobjectvery\phantom{\rule{0ex}{0ex}}closetothelens?\phantom{\rule{0ex}{0ex}}Ans.\left(i\right)Hemovesthelensinadirectionawayfromscreen.$