The human eye can clearly see up to which distance ? Infinity 1000 km 100 km 10 km

A person is able to see objects clearly only when these are lying at a distance between 50 cm and 300 cm from his eye. (a) What kind of defects of vision is he suffering from ? (b) What kind of lenses are required to increases his range of vision from 25 cm to infinity ? Explain briefly.

An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is moving twice as fast i.e. 120 km/h, the stopping distance will be

A myopic person can see things clearly only when they lie between 10 cm and 100 cm from his eye. Answer the following questions. A lens will enable him to see the moon clearly if its focal length is :

From the pair of linear equations for the following problems and find their solution by substitution method. The taxi charge in a city consist of a fixed charge together with the charge for the distance covered. For a distance of 10 km, the charge paid is Rs. 105 and for a journey of 15 km, the charge paid is Rs. 155. What are the fixed charges and the charge per km ? How much does a person have to pay for travelling a distance of 25 km ?

The human eye can focus objects at different distance by adjusting the focal length of the eye lens. This is due to