A person needs a lens of power – 2.5 dioptres for correcting his vision. Name the defect of vision he is suffering from.

(b) – 0.5 D. is the correct option.

(a) Myopia (b) f=1/(-4.5)=-2/9m       =-0.22m (c) Concave lens

(a) Not suffering from water scarcity (b) Suffering from water scarcity (c) Suffering from water scarcity (d) Not suffering from water scarcity

Given P=+ 1.5D As P=1/f (in metre) , Focal length, f =1/P=1/1.5=0.667m=66.7cm As power of prescribed lens is positive, the lens is converging (or convex) lens.

The SI unit of power of a lens is dioptre. The power of a converging lens is positive as f is +ve.

Near-sightedness/Short-sightedness/ Myopia.

Far-sightedness/Long-sightedness/Hypermetropia.

The defects of the eye due to which a person is unable to distinguish between certain colors is known as color blindness. Cone shaped retinal cells are responsible for making...

(a) Myopia (b) f=1/(-4.5)=-2/9m =-0.22m (c) Concave lens

(a) Task 1 can not be assigned to either person 1 or 2 i.e. there are 4 options. Task 2 can be assigned to 3 or 4 So, there are only 2 options...