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Topic Question Set

Q 1 :

Identify the physical quantity that cannot be measured using spherometer :                  [2024]

  • Radius of curvature of concave surface

     

  • Specific rotation of liquids

     

  • Thickness of thin plates

     

  • Radius of curvature of convex surface

     

(2)           

Spherometer can be used to measure curvature of surface.

 

Q 2 :

Let u and v be the distances of the object and the image from a lens of focal length f. The correct graphical representation of u and v for a convex lens when |u|>f, is        [2025]

  •  

  •  

  •  

  •  

(2)

Lens formula 1v-1u=1f 

1v=1f+1u

Since |u|>f

So, RHS is positive.

Q 3 :

In parallax method for the determination of focal length of a concave mirror, the object should always be placed:    [2026]

  • between the focus (F) and the centre of curvature (C) of the mirror ONLY

     

  • at any point beyond the focus (F) of the mirror

     

  • between the pole (P) and the focus (F) of the concave mirror ONLY

     

  • beyond the centre of the curvature (C) of the mirror ONLY

     

(2)

Image should be real. So object should be placed beyond focus.