If aperson uses spectacles of Power `+1.0` dioptre, what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.

The focal length of the objective an astoomical telescope is 75 cm and that of the eye-piece is 5 cm.If the final image is ofrmed at the least distance of ditinct vision from the eye,calculate the magnifying power of the telescope.

A person wear spectacles of power-2.3 D Name the defect of vision he is suffering from.Draw the ray diagram for: The defective eye

A telescope has an objective of focal length 50 cm and eye-piece of focal length 5 cm.the last distance of distinct vision is 25 cm.The telescope is focussed for ditinct vision on a scale 200 cm awya from teh objective.Caculate the magnification produced.

A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm)? What is the magnifying power of the microscope in?