Q. An object, very big compared to the source of light is placed next to it. the shadow which will form on the screen is likely to have one of the following characteristics.

a. the shadow will consist of umbra only

b. the shadow will consist of penumbra only

c. The shadow will consist of both umbra and penumbra, but umbra will be faint as compared to penumbra

d. no shadow will be formed

....................kindly explain...........