SELF-ASSESSMENT TEST

Draw a ray diagram to show the image formed when an object is placed between pole and focus of the concave mirror.

The absolute refractive index of Ruby is $1.7$. Find the speed of light in Ruby. The speed of light in vacuum is $3\times {10}^8 \mathrm{m}/\mathrm{s}$.

The power of a lens is $+5$ dioptres. What is the nature and focal length of this lens? At what distance from this lens should an object be placed so as to get its inverted image of the same size?

Find the position of an object which when placed in front of a concave mirror of focal length $20 \mathrm{cm}$ produces a virtual image twice the size of the object.

You have two lenses A and B of focal lengths $+10 \mathrm{cm}$  and  $-10 \mathrm{cm}$ respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed $8 \mathrm{cm}$ from the lens? Draw a ray diagram to justify your answer.

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed in front of a convex lens at F.

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed at 2F of a convex lens

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed between the lens and infinity of a concave lens.