A student can distinctly see the object ...

A student can distinctly see the object upto a distance `15 cm`. He wants to see the black board at a distance of `3m`. Focal length and power of lens used respectively will be

A

`-4.8 cm`, `-3.3 D`

B

`-5.8 cm, -4.3 D`

C

`-7.5 cm, -6.3 D`

D

`-15.8 cm, -6.3 D`

Text Solution

Verified by Experts

The correct Answer is:

d

Topper's Solved these Questions

RAY OPTICS
ERRORLESS |Exercise Refraction of Light at Plane Surfaces|9 Videos
RAY OPTICS
ERRORLESS |Exercise Refraction at Curved Surface|8 Videos
MAGNETISM
ERRORLESS |Exercise Assertion & Reason|1 Videos
WAVE OPTICS
ERRORLESS |Exercise SET|23 Videos

Similar Questions

Explore conceptually related problems

A person is unable to see objects nearer than 50 cm. He wants to read a book placed at a distance of 25 cm. Find the nature, focal length and power of the lens he requires for his spectacles.

A person can see clearly only upto a distance of 25 cm . He wants to read a book placed at a distance of 50cm . What kind of lens does he require for his spectacles and what must be its power ?

If a person can sees clearly at a distance of 100 cm, then find the power of leris used to see object at 40 cm.

A person can see object clearly only upto a maximum distance of 50 cm. Hi eye defect, nature of the corrective lens and its focal length are respectively

A person can not see the objects clearly placed at a distance more than 40 cm . He is advised to use a lens of power

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Name the type of lens used to correct this defect?

A person can not see an object lying beyond 80cm whereas a normal person can easily see the object distant 160cm .The focal lengthand the nature of the lens used to rectify this defect will be-

ERRORLESS -RAY OPTICS-SET

A student can distinctly see the object upto a distance 15 cm. He want...
Text Solution
|
In an astronomical telescope in normal adjustment a straight black lin...
Text Solution
|
Three lenses L(1) , L(2) , L(3) are placed co-axially as shown in figu...
Text Solution
|
An object is placed at a point distant x from the focus of a convex le...
Text Solution
|
The diameter of the eye-ball of a normal eye is about 2.5 cm . The pow...
Text Solution
|
In a thin spherical fish bowl of radius 10 cm filled with water of ref...
Text Solution
|
A small fish 0.4 m below the surface of a lake is viewed through a sim...
Text Solution
|
A water drop in air refractes the light ray as
Text Solution
|
Which of the following ray diagram show physically possible refraction...
Text Solution
|
Following figure shows the multiple reflections of a light ray along a...
Text Solution
|
When the rectangular metal tank is filled to the top with an unknown l...
Text Solution
|
A concave mirror and a converging lens (glass with mu = 1.5) both have...
Text Solution
|
A ray of light strikes a plane mirror M at an angle of 45^(@) as shown...
Text Solution
|
A slab of glass, of thickness 6 cm and refractive index 1.5, is placed...
Text Solution
|
A point source of light S is placed at the bottom of a vessel containi...
Text Solution
|
A point object is placed midway between two plane mirrors a distance a...
Text Solution
|
A convergent beam of light is incident on a convex mirror so as to con...
Text Solution
|
PQR is a right angled prism with other angles as 60^(@) and 30^(@). Re...
Text Solution
|
When a ray is refracted from one medium to another, the wavelength cha...
Text Solution
|
Two this lenses, when in contact, produce a combination of power +10 d...
Text Solution
|
The plane faces of two identical plano convex lenses, each with focal ...
Text Solution
|