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Subjective Question
A pin is placed 10 cm in front of a convex lens of focal length 20 cm, made of material of refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature 22 cm. Determine the position of the final image. Is the image real or virtual?

Chemistry

The osmotic pressure of a solution containing 0.10 g of haemoglobin in 10.0 cm³ of solution is 2.67 Torr at 1^oC. Estimate the molar mass of haemoglobin.

Mathematics

If w