364851 For the thin convex lens, the radii of curvature are at \(15\,cm\) and \(30\,cm\) respectively. The focal length of the lens is \(20\,cm.\) The refractive index of the material is

364852 A needle placed \(45\,cm\) from a lens forms an image on the screen placed \(90\,cm\) on the other side of the lens. What is the size of image if the size of needle in \(5\,cm\)? And what is the focal length of lens?

364853 If \({I_1}\) and \({I_2}\) be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by

364854 A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
1. Half of the image will disappear
2. No part of image will disappear
3. Intensity of the image will increase
4. Intensity of the image will decrease

364851 For the thin convex lens, the radii of curvature are at \(15\,cm\) and \(30\,cm\) respectively. The focal length of the lens is \(20\,cm.\) The refractive index of the material is

364852 A needle placed \(45\,cm\) from a lens forms an image on the screen placed \(90\,cm\) on the other side of the lens. What is the size of image if the size of needle in \(5\,cm\)? And what is the focal length of lens?

364853 If \({I_1}\) and \({I_2}\) be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by

364854 A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
1. Half of the image will disappear
2. No part of image will disappear
3. Intensity of the image will increase
4. Intensity of the image will decrease

364851 For the thin convex lens, the radii of curvature are at \(15\,cm\) and \(30\,cm\) respectively. The focal length of the lens is \(20\,cm.\) The refractive index of the material is

364852 A needle placed \(45\,cm\) from a lens forms an image on the screen placed \(90\,cm\) on the other side of the lens. What is the size of image if the size of needle in \(5\,cm\)? And what is the focal length of lens?

364853 If \({I_1}\) and \({I_2}\) be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by

364854 A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
1. Half of the image will disappear
2. No part of image will disappear
3. Intensity of the image will increase
4. Intensity of the image will decrease

364851 For the thin convex lens, the radii of curvature are at \(15\,cm\) and \(30\,cm\) respectively. The focal length of the lens is \(20\,cm.\) The refractive index of the material is

364852 A needle placed \(45\,cm\) from a lens forms an image on the screen placed \(90\,cm\) on the other side of the lens. What is the size of image if the size of needle in \(5\,cm\)? And what is the focal length of lens?

364853 If \({I_1}\) and \({I_2}\) be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by

364854 A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
1. Half of the image will disappear
2. No part of image will disappear
3. Intensity of the image will increase
4. Intensity of the image will decrease