Find the focal length of a lens of power $-2.0 \, D$. What type of lens is this?
- A$-50 \, cm$; Concave lens.
- B$-0.50 \, cm$; Concave lens.
- C$-0.50 \, cm$; Convex lens.
- D$-50 \, cm$; Convex lens.
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The image formed by a concave mirror is observed to be virtual,erect and larger than the object. Where should be the position of the object?
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Material medium Refractive index Air $1.0003$ Ice $1.31$ Water $1.33$ Alcohol $1.36$ Kerosene $1.44$ Fused quartz $1.46$ Turpentine oil $1.47$ Benzene $1.50$ Crown glass $1.52$ Canada Balsam $1.53$ Rock salt $1.54$ Carbon disulphide $1.63$ Dense flint glass $1.65$ Ruby $1.71$ Sapphire $1.77$ Diamond $2.42$
| Material medium | Refractive index |
| Air | $1.0003$ |
| Ice | $1.31$ |
| Water | $1.33$ |
| Alcohol | $1.36$ |
| Kerosene | $1.44$ |
| Fused quartz | $1.46$ |
| Turpentine oil | $1.47$ |
| Benzene | $1.50$ |
| Crown glass | $1.52$ |
| Canada Balsam | $1.53$ |
| Rock salt | $1.54$ |
| Carbon disulphide | $1.63$ |
| Dense flint glass | $1.65$ |
| Ruby | $1.71$ |
| Sapphire | $1.77$ |
| Diamond | $2.42$ |
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