A man can see clearly up to 3 metres. Prescribes a lens for his spectacles so that he can see clearly up to `12 ` metres

(a) A person can see clearly upto 80 cm . He uses spectacles of -0.80 dioptre , how far can he see clearly ? (b) If a person uses spectacles of power + 1.0 dioptre , what is the nearest distance of distinct vision for him ? Given that near point of the person is 75 cm from the eye.

A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is

A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length

A person who can see things most clearly at a distance of 10 cm . Requires spectacles to enable to him to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles ?

A far-sighted man can see clearly at a distance of 1.0m . The power of the lens that would make him see clearly at a distance of 0.2m is

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. Which of the two lenses can form a real image?

Shashank went to the optician to get his eyes checked. He observed that the doctor combined two lenses and put these in front of his eyes so that he could see clearly. The powers of the two lenses used in the combination were -3 D and 4 D. What type of lens will the combination of lenses be?