Geometrical OpticsEasy
Question
The length of astronomical telescope is 15 cm and has magnifying power 4 for normal adjustment. Focal length of the lenses are :-
Options
A.3 cm, 12 cm
B.2 cm, 12 cm
C.3 cm 15 cm
D.4 cm, 11 cm
Solution
L = f0 + fe and |MP| = 
⇒ 15 = f0 + fe & 4 =
⇒ fe = 3 cm and f0 = 12 cm
⇒ 15 = f0 + fe & 4 =
⇒ fe = 3 cm and f0 = 12 cm
Create a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face,...A man of height 170 cm wants to see his complete image in a plane mirror (while standing ). His eyes are at a height of ...Consider the situation shown in figure. Water is filled in a beaker up to a height of 10 cm. A plane mirror is fixed at ...A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the pr...A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3). Light beam incident normally on the f...