What is the power of convex lens whose focal length is 50 cm?
Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D. Since, a convex lens is a converging lens, thepower of the convex lens is +2D………
Where an object should be placed from a converging lens of focal length 15 cm so as to obtain the image of same size and real?
The object should be placed between 15cm and 30 cm( Between f and 2f) from the converging lens to obtain a real and magnified image.
Where should an object be placed from a converging lens of focal length 20 cm?
A convex lens of focal length 20 cm forms a real and magnified image when the object is placed between 20 cm and 40 cm.
Where should an object be placed in front of a converging lens to get an image which has exactly the same size as the object?
To obtain an object of real, inverted and same size as the object from a converging lens object has to be located at the 2F point then the image will also be located at the 2F point on the other side of the lens. The image dimensions will be equal to the object dimensions.
When should an object be placed from a converging lens?
Where should an object be placed in front of a concave mirror of focal length 20cm so as to obtain?
Where should an object be placed in front of a concave mirror of focal length 20 cm so as to obtain a two time magnified real image? [2011] Ans: 30 cm.
Where should an object be placed in front of a convex lens of focal length of 20cm so as to obtain an image double the size of object?
Answer: At twice the focal length, the image formed by the convex lens is real and of the same size as the object. If the lens has a focal length of 20 cm, the object must be positioned 40 cm in front of the lens, creating an inverted image of the same size as the target, 40 cm behind the lens.
Where should the object be placed near a convex lens of focal length 20 cm to get a two times magnified real image?
Object should be placed at 15cm in front of the lens.
How far from a convex lens of focal length 20 cm would you place an object to get an image enlarged 3 times?
u= -2 x 20/3 = -40/3 cm. u= -2 x 20/3 = -40/3 cm. Answer: Between the centre of the curvature and its focus, if the image is real.
What is the power of a lens with a focal length of 20 cm?
20 CM in metres= 20/100m=1/5 metres. power of a lens= 1/1/1/5=5 dioptres……..
How far should an object be placed from a convex lens of focal length 20 cm to obtain its image at a distance of 30 cm from the lens what will be the height of the image if the object is 6 cm tall?
Object distance from convex lens and height of the image. An object should be placed at distance 60 cm from the convex lens.
At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side .what will be the magnification produced in this case?
Solution. T the object should be placed at a distance of 72 cm from the lens.
At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image of 36?
At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 36 cm from it ? What will be the magnification produced in this case? m=? ∴u=-36cm and u=-12cm.
At what distance should an object be placed from a convex lens of focal length 20cm to obtain an image at 30 cm from it on the other side what will be the magnification produced in this case?
An object is placed at a distance of 30 cm from a convex lens of focal length 20 cm. Image distance, v = ? v=60010=60 cm .
What is the distance in front of a concave mirror of focal length?
The object should be placed at a distance of 40cm Therefore, the object should be placed at 40 cm in front of the convex mirror.
At what distance from a concave mirror of focal length 10 cm should an object be placed so that its image is formed 20 cm from the mirror?
Solution. Therefore, the object must be placed at a distance of cm from the mirror to form the virtual image.
At what distance the object should be placed so that the image will be formed at a distance 10 cm?
At what distance the object should be placed so that the image will be formed at a distance 10 cm from a concave lens? Focal length of the lens is 20 cm.