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

   

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 $\left|u\right|>f$, is        [2025]

Q 3 :

Five persons $P_1,P_2,P_3,P_4$ and $P_5$ recorded object distance $\left(u\right)$ and image distance (v) using same convex lens having power +5D as (25,96), (30,62), (35,37), (45,35) and (50,32) respectively. Identify correct statement                   [2026]

• Readings recorded by $P_3$ and $P_2$ persons are incorrect

   

• Readings recorded by $P_3$ person are incorrect

   

• Readings recorded by $P_4$ and $P_5$ persons are incorrect

   

• Readings recorded by all persons are correct

   

Q 4 :

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