Focal length of concave lens is positive or negative
Asked by admin @ in Physics viewed by 345 People
Why is the focal length of concave lens taken as negative
Answered by admin @
Answer:-
A concave lens diverges the rays incident on it. So the image will be formed behind the lens. ... you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens.
Similar Questions
In concave mirror focal length is positive or negative
Asked by admin @ in Physics viewed by 327 persons
Focal length of concave mirror is positive or negative
Focal length of concave mirror is positive or negative
Asked by admin @ in Physics viewed by 345 persons
Focal length of concave mirror is positive or negative
A concave lens of focal length 15 cm
Asked by admin @ in Physics viewed by 338 persons
a concave lens of focal length 15 cm forms an image 10cm from the lens. how far is the object placed from the lens draw the ray diagram
A concave lens has a focal length of 20cm
Asked by admin @ in Physics viewed by 331 persons
A concave lens has focal length of 20 cm. At what distance from the lens should a 5 cm tall object be placed so that it forms an image at …
Find the power of concave lens of focal length
Asked by admin @ in Physics viewed by 265 persons
Find the power of concave lens of focal length 2 m.
Find the power of a concave lens of focal length
Asked by admin @ in Physics viewed by 294 persons
Find the power of concave lens of focal length 2 m.
Focal length of convex mirror is positive or negative
Asked by admin @ in Science viewed by 274 persons
Focal length of concave and convex mirror is positive or negative ?
Power of convex lens is positive or negative
Asked by admin @ in Physics viewed by 320 persons
Why is the power of convex lens positive and that of a concave lens negative
A convex lens of focal length 25 cm
Asked by admin @ in Physics viewed by 324 persons
A convex lens of focal length 25cm and a concave lens of focal length 10cm are placed in close contact with each other. Calculate the lens power of this combination.
For a concave mirror of focal length 20cm
Asked by admin @ in Physics viewed by 291 persons
A concave mirror of focal length 20cm produces an image twice the height of an object .if the image is real ,then the distance of the object from the mirror …
Power of lens is its focal length is
Asked by admin @ in Physics viewed by 316 persons
Power of the lens is -4d, then its focal length is -----?
Two plano convex lens each of focal length 10cm
Asked by admin @ in Physics viewed by 332 persons
Two plano convex lenses each of focal length 10cm and refractive index 3/2 are placed as shown in the future. in the space left, water (r.i=4/3) is filled. the whole …
Find the focal length of lens of power 2d
Asked by admin @ in Science viewed by 323 persons
Find the focal length of a lens of power , -2 D .what type of lens is this ??answer fast...
A biconvex lens has focal length 2 3 times
Asked by admin @ in Physics viewed by 322 persons
A bi convex lens has focal length 2/3 times radius of curvature of either surface calculate refractive index of the lens material
A student uses a lens of focal length 40cm
Asked by admin @ in Science viewed by 334 persons
A student uses a lens of focal length 40cm and another of -20cm. Write the nature and power of each lens.
Most viewed questions in Physics
Jeevandeep health and physical education std 10 answers pdf
Asked by admin @ in Physics viewed by 11082 persons
Hc verma physics class 9 solutions of describing motion
Asked by admin @ in Physics viewed by 2677 persons
Base area and stability of some objects with different shapes
Asked by admin @ in Physics viewed by 1537 persons
Which of the following statements about safe lifting are correct
Asked by admin @ in Physics viewed by 1524 persons
A rocket of mass m is launched straight up with thrust f⃗ thrust.
Asked by maham237 @ in Physics viewed by 1324 persons
A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is
Asked by maham237 @ in Physics viewed by 1212 persons
Mind map for light reflection and refraction class 10
Asked by admin @ in Physics viewed by 1156 persons
The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.
Asked by maham237 @ in Physics viewed by 1105 persons
A 5.8 x 10 4 watt elevator motor can lift
Asked by maham237 @ in Physics viewed by 1087 persons