MCQ
On increasing temperature resistivity of semiconductor:
- Aincreases
- ✓decreases
- Cremains same
- Dfirst increases then decreases
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($A$) The refractive index of the lens is $2.5$
($B$) The radius of curvature of the convex surface is $45 \mathrm{~cm}$
($C$) The faint image is erect and real
($D$) The focal length of the lens is $20 \mathrm{~cm}$
