Q31 of 38 Page 84

Draw ray diagrams showing the image formation by a convex lens when an object is placed

(a) between optical center and focus of the lens


(b) between focus and twice the focal length of the lens


(c) at twice the focal length of the lens


(d) at infinity


(e) at the focus of the lens

(a) Ray diagram when an object is placed between optical centre and focus of the lens:



(b) Ray diagram when an object is placed between focus and twice the focal length of the lens:



(c) Ray diagram when an object is placed at twice the focal length of the lens



(d) Ray diagram when an object is placed at infinity



(e) Ray diagram when the object is placed at the focus of the lens:



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29

Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.

 30

Draw ray diagrams showing the image formation by a concave mirror when an object is placed

(a) between pole and focus of the mirror


(b) between focus and center of curvature of the mirror


(c) at center of curvature of the mirror


(d) a little beyond center of curvature of the mirror


(e) at infinity

 32

Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.

 33

Draw ray diagrams showing the image formation by a concave lens when an object is placed

(a) at the focus of the lens


(b) between focus and twice the focal length of the lens


(c) beyond twice the focal length of the lens