f = focal length, i = image length/height, o = object length from lens or mirror 5. DO NOT FORGET that convex mirrors are divergent and concave are convergent. That's how you use the above 4 steps to solve problems. Easy to remember because if you picture a light ray as a tennis ball you throw at a...Image size Formula Questions: 1) A lens formed an image at 30 cm, the object of 2 cm height is placed in front at 1 m. What is the size of the image? Answer: From the image size formula: hi/ho = - I/o. hi = -I/o * ho = - (30 cm / 100 cm) * 2 cm. hi = -0.15 cm. The minus sign indicates that the virtual image is inverted.
converging (convex) lenses. The lens equation can be used to calculate the image distance for either real or virtual images and for either positive on negative lenses. The linear magnification relationship allows you to predict the size of the image. If the magnification is negative, the image is inverted.