Which cells of the retina enable us to see coloured objects around us?

Which type of cells of eye enable us to see in the dark?

What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?

If far point of myopic person is 50 cm in front of the eye, what is the power of lens required to enable him to see very distant objects clearly ?

Draw the symbol and the reverse bias I-V characterstics of a zener diode. Explain briefly, which property of the characterstics enables us to use zener diode as voltage regulator.

The far point of a myopic person is 80 cm. In front of the eye. What is the power of the lens required to enable him to see very distant objects clearly ? In what way does the corrective lens help the person above?Does the lens magnify very distant objects?Explain.