Where is red light area in nashik.​

A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow ? Explain.

The pigment that absorbs red and far red light in plants is

In a YDSE experiment red light is replaces by violet light . Then

Red light is incident on a converging lens of focal length f . State with reason hoe f will change if red light is replaced by blue light.

Green light ejects photoelectrons from a given photosenstive surface where as yellow light does not. What will happen in case of violet and red light? Give reason for your answer.