Test of Ray Optics|Class12|Chapter9

Q1-State two main considerations taken into account while choosing the objective of astronomical telescope.   (2)

Q2-State the advantages of reflecting type telescope over the refracting type.  (2)

Q3-Draw the ray diagram of compound microscope and write the expression for its magnifying power at normal adjustment.   (2)

Q4-Draw the ray diagram  to show use of TIR in (I) optical fibre (ii)a prism that bends the ray by 90⁰.   (2)

Q5-Derive the lens makers formula.
Write the assumptions used in it.  (3)

Q6-Prove the lens formula using concave formula and also it's magnification.  (3)

Q7-A biconvex lens has a focal length 2/3 times the radius of curvature of either surface.Calculate the refractive index of lens material.     (  2)

Q8-Light from a point source in air falls on a convex spherical glass surface of refractive index 1.5 and radius of curvature 20 cm.The distance of light source from the glass surface is 100 cm.At what position is the image formed?   (2) 

Q9-Derive the expression for relation between real depth and apparent depth.(2)

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