What is visual angle ?

What is visual cycle?

What is the visual change observed when glucose is heated with Fehling' solution?

On seeing with unaided eye, the visual angle of moon at the eye is 0.6^(@) . The focal lengths of the objective and the eyepiece of a telescope are respectively 200 cm and 5 cm. What will the visual angle on seeing through the telescope?

Define magnifying power of a microscope in terms of visual angle.

(i) Define magnifying power of a microscope in terms of visual angle. (ii) What is the advantage of a compound microscope over a simple microscope ?

(b) What is Visual Communication Device? Give examples.

What is the minimum distance between two objects which can be resolved by a microscope having the visual angle of 30^@ when light of wavelength 500 nm is used ?