A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram.What is the actual length of the bacteria ?If the photograph is enlarged 20,000 times only,what would be its enlarged length ?

The length of Ramesh's notebook is 9 cm 5 mm.What will be its length in cm?

The length of a rectangle is 7.1 cm and its breadth is 2.5 cm. What is the area of the rectangle?

What is the length of the wooden strip required to frame a photograph of length and breadth 32 cm and 21 cm respectively?

A steel tape 1 metre long is correctly calibrated for temperature of 27.0^@C . The length of a steel rod measured by this tape is found to be 63.0 cm on a h ot day when the temperature is 45^@C . What is the actual length of the steel rod on that day? What is the length of the same steel rod on a day when the temperature is 27.0^@C ? Coefficient of linear expansion of steel = 1.20 xx 10^-5 C^-1 .

Mahesh wanted to measure the length of his table top in metre.He had a 50 cm scale.He found that the length of the table top was 156 cm.What will be its length in metres?

At what distance should be placed from a convex lens of focal length 15 cm to obtain an image three times the size of the object?

A double convex lens has 10 cm and 15 cm as its two radii of curvature.The image of an object,placed 30 cm from the lens,is formed at 20 cm from the lens on the other side.Find the refractive index of the material of the lens.Whgat will be the focal length ?What will be the focal length of the lens,if it is immersed in water of refractive index 1.33?

The image obtained with a convex lens is erect and its lenth is four times the length of the object.If the focal length of the lens is 20 cm,calculate the object and image distance.