Q.

Assertion : Light bends from its path when it goes from one medium to another medium.
Reason : Speed of light changes, when it goes from one medium to another medium.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but reason is false.  
4 Assertion is false but reason is true.  

Ans.

(1)

When the light travels from one medium to another, its speed changes so, it bends from its path. Thus, both assertion and reason are correct and reason is the correct explanation of the assertion.