Through which part of the eye do light rays from an object first enter the eye?

$(a)$ What is "power of accommodation of the eye"?
$(b)$ What happens to the image distance when the object being viewed is moved away from the eye?

$(a)$ State two main causes of a person developing near-sightedness (myopia). With the help of a ray diagram, suggest how this disability can be corrected.
$(b)$ The far point of a myopic person is $150 \ cm$ in front of the eye. Calculate the focal length and power of the lens required to enable him to see distant objects clearly.

Name the part of the eye where the image is formed by the eye lens. What is the nature of the image formed? How is this image sent to the brain?

When blue and green light overlap,what color does that region appear?

$A$ narrow beam $PQ$ of white light is passing through a glass prism $ABC$ as shown in the diagram.
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen $DE$.
$(i)$ Write the name and cause of the phenomenon observed.
$(ii)$ Where else in nature is this phenomenon observed?
$(iii)$ Based on this observation,state the conclusion which can be drawn about the constituents of white light.