Science
Assertion (A): A point object is placed at a distance of 26 cm from a convex mirror of focal length 26 cm. The image will not form at infinity. Reason (R): For above given system the equation gives v = ∞. options 1. Both A and R are true, and R is the correct explanation of A. 2. Both A and R are true, and R is not the correct explanation of A. 3. A is true but R is false. 4. A is false but R is true.
Related Questions
Choose the correct option from the below which explains the reason for us to perceive the day sky as blue.
options
- As sunlight passes through the atmosphere, shorter wavelengths, such as blue are scattered more than other colors.
- The sky appears blue because all colors are scattered equally, but blue light is stronger and more visible to the human eye.
- The blue color of the sky is due to longer wavelengths like red and orange scattering more than shorter wavelengths, making blue stand out more.
- The atmosphere contains blue-colored particles that give the sky its blue appearance.
The below image shows the formation of an image with an optical instrument.
(a) Identify the optical instrument (shown schematically as a rectangle) in the image.
(b) What type of image is formed in this case?
(c) Based on the measurements given in the image, calculate the focal length of the instrument.
(a) Under what conditions can a convex lens form a virtual image?
(b) Why does a piece of paper catch fire if we allow sunlight to pass through a convex lens onto the paper?