The value of “least distance of distinct vision” at young age i.e below 10 years ………………. 

Correct option is  A) 25 cm

Correct option is  D) 1 to 2 m

D) X is false, Y is true

Correct option is  C) 2.27 cm

D) between 2.27 cm to 2.50 cm

D) Angle of vision and least distance of distinct vision are same for all persons

Correct option is  B) 15 years

Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...

Let the present age of Shikha be ‘a’ years.  Given, product of Shikha’s age five years ago and her age 8 years later is 30  ⇒ (a – 5)(a + 8) =...