8.Your peripheral vision range _______________ as you move closer to a focal point.A. SharpensB. DiminishesC. MagnifiesD. None of the above

3.The type of vision you use to focus on things is called "focal vision" or ____________.

Define the following :(i) Focal length.(ii) Principal focus

A person uses a lens of power + 3D to normalise vision. Near point of hypermetropic eye is(A) 1 m (B) 1.66 m(C) 2 m (D) 0.66 m

A researcher uses a microscope with a convex lens to view a sample.  The distance from the sample to the lens is 5 cm, and the distance from the lens to the retina is 20 cm.  If the distance from the sample to the lens increases by 15 cm, the image is now focused:A.15 cm in front of the retina.B.5 cm in front of the retina.C.5 cm behind the retina.D.15 cm behind the retina.

Define the focal length of a lens.The distance to the furthest object that can be seen through itThe minimum thicknessThe distance from the focal point to the centre of the lensIts distance from an observer's eye