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Ray Optics 5 Mark Creative Question Paper With Answer Key

12th Standard

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Physics

Time : 01:00:00 Hrs
Total Marks : 75

     5 Marks 

    15 x 5 = 75
  1. Obtain lens maker’s formula and mention its significance.

  2. Derive the equation for effective focal length for lenses in out of contact

  3. The focal length of an equiconvex lens is equal to the radius of curvature of either face. What is the value of refractive index of the material of the lens?

  4. A ray of light falls on a transparent sphere with centre C as shown in the figure. The ray emerges from the sphere paralled to the line AB. Find the angle of refraction at A if refraction index of the material of the sphere is \(\sqrt { 3 } \)

  5. For the same angle of incidence, the angle of refraction in two media A and Bare 25° and 35° respectively. In which one of the two media is the speed of light lesser?

  6. A biconvex lens with its two faces of the equal radius of curvature R is made of a transparent medium of refractive index ~2 as shown in the figure.

    (i) Find the equivalent focal length of the combination.
    (ii) Obtain the condition when this combination acts as a diverging lens.
    (iii) Draw the ray diagram for the case (\({ \mu }_{ 1 }​​>({ \mu }_{ 2 }+1)\) + 1) / 2 when the object is kept far away from the lens. Point out the nature of the image formed by the system.

  7. (I) Calculate the distance of an object of height h from a concave mirror of radius of curvature 20 cm, so as to obtain a real image of magnification 2. Find the location of image also.
    (ii) Using mirror formula, explain why does a convex mirror always produce a virtual image.

  8. (i) For a glass ( \(\mu =\sqrt { 5 } \)) the angle of minimum deviation is equal to the angle of the prism. Find the angle of the prism.
    (ii) Draw ray diagram when incident ray falls normally on one of the two equal sides of a right-angled isosceles prism having refractive indeed \(\mu =\sqrt { 3 } \).

  9. An object is placed 40 cm from a convex lens of focal length 30 cm, If a concave lens of focal length 50 cm is introduced between the convex lens and the image formed such that it is 20 cm from the convex lens, find the change in the position of the image.

  10. (i) A ray of light incident on face AB of an equilateral glass prism, shows minimum deviation of 30o. Calculate the speed of light through the prism.

    (ii) Find the angle of incidence at face AB is that the emergent ray grazes along the face AC.

  11. A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of the ray through the prism. From which face will the ray emerge? Justify your answer.

  12. A double convex lens, made from a material of refractive index μ1 is immersed in a liquid of refractive index μwhere μ> μ1 What change, if any, would occur in the nature of the lens?

  13. Draw a plot showing the variation of power of a lens with the wavelength of the incident light.

  14. Two thin lines of powers -4D and 2D are placed in contact coaxially. Find the focal length of the combination.

  15. A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm. Find the power of concave lens.

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