How will you decide whether a given piece of glass is a convex lens,concave lens,or a plane glass plate?

  • A
    By observing the image of printed matter through the glass.
  • B
    By measuring the thickness of the glass.
  • C
    By checking the weight of the glass.
  • D
    By checking the color of the glass.

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The refractive index of dense flint glass is $1.65$ and for alcohol it is $1.36,$ with respect to air. What is the refractive index of dense flint glass with respect to alcohol?

Which of the lenses with focal lengths $10 \, cm$,$20 \, cm$,$25 \, cm$,and $50 \, cm$ has the maximum power (in $, cm$)?

What is the focal length of a convex lens having power $+5.0 \,D$?

Name the type of lens that can be used as a magnifying glass. Give reason$(s)$ and draw a ray diagram to support your answer.

Where is the image formed when an object is placed at the principal focus $(F)$ in front of a convex lens?

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