Question: Q. 9. Write the relationship between angle of incidence ’ $i$ ‘, angle of prism ’ $A$ ’ and angle of minimum deviation for triangular prism. $\quad \mathrm{R}$ [Delhi 2013]
$$ \begin{equation*} \text {
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Solution:
Ans. } \quad A+\delta_{m}=2 i \tag{1} \end{equation*} $$
[CBSE Marking Scheme 2013]
[AI $Q$. 10. If the wavelength of light incident on a convex lens is increased, how will its focal length change?
[O.D. Comptt. I, II, III 2013]
Ans. If the wavelength of light incident on a convex lens is increased, its focal length will also increase.
[CBSE Marking Scheme 2013]
