RAY OPTICS CLASS XI
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Q12)Where should an
object be placed from a converging lens of focal length 20cm so as to obtain
a real image of magnification 2?
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Q13)Write the difference between dispersive and non
dispersive medium with examples.
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Q14)Show that lateral displacement is directly
proportional to t and i1.
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Q15)What is the main requirement in the fabrication of
optical fibres? How it can be
achieved? Write two examples
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Q16)Obtain a relation for refraction from a rarer to
denser medium at a convex spherical surface forming real image.
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Q17)Derive thin lens formula for a concave lens .
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Q18)A double convex lens made of glass of refractive index
1.5 has both curvatures of radii 20cm. An object 2cm high is placed 2cm from
this lens , find the position, nature and size of the image.
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Q19)The angle of minimum deviation for yellow light in a
prism of refractive index 1.6 is found to be 460. Calculate
refracting angle of the prism.
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Q20)Derive lens makers formula.
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Q21)For refraction through prism derive prism formula.
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