光楽
Android app by Fuji Bit. Education · Fuji Bit
- Store rating
- Unknown
- Store rating count
- Unknown
- Download price
- Free to download
- In-app purchases
- Not listed in captured metadata
- Version
- 5.0.0
- Listing last refreshed
- 2026-09-16
View the original store listing
Store description excerpt
KORAKU is an educational simulation app that allows users to interactively experience optical phenomena. This is the fourth installment in the series, following SUUGAKU (Mathematics), BUTURAKU (Objects), and HARAKU (Waves). This time, the theme is "Light." Through 10 different simulations, you can learn about the behavior of light, from geometrical optics to quantum phenomena, while having fun. 【10 Simulations】 ■ Lens (Thin Lens) Observe the optical path and image formation of convex and concave lenses in real time. By freely changing the focal length, object distance, and object height, you can experience the formula for thin lenses (1/f = 1/a + 1/b). ■ Spherical Mirror Switch between concave and convex mirrors to visualize the image formation of a spherical mirror. By changing the radius of curvature and object distance, you can observe how real and virtual images, and inverted and upright images, switch. ■ Prism Dispersion Simulates how white light passes through a prism and separates into a rainbow spectrum. The spectrum is plotted based on Snell's law and Cauchy dispersion. ■ Rainbow Tracks the path of light entering a raindrop, from refraction and internal reflection to refraction and exit. Reproduces the angles and color order of the primary and secondary rainbows centered on the antisolar point based on the deflection angle for each wavelength. ■ Diffraction Grating Visualizes multi-slit interference patterns. By changing the slit spacing and wavelength, you can intuitively understand the diffraction condition d sin(θ) = mλ. ■ Optical Fiber Simulates the propagation of light by total internal reflection. By changing the angle of incidence and refractive index, you can learn the relationship between the critical angle and numerical aperture (NA). ■ Polarization By changing the angles of the polarizer and analyzer, you can observe the change in light transmission intensity according to Malus's law (I = I₀cos²θ). ■ Thin Film Interference Reproduces the iridescent colors of soap bubbles and oil films. By changing the film thickness, refractive index, and angle of incidence, you can observe interference colors due to optical path differences. ■ Primary Colors (Color Mixing) Compare additive color mixing of the three primary colors of light (RGB) and subtractive color mixing of the three primary colors of pigments (CMY) by switching modes. Adjust each component with three sliders and check the RGB value of the composite color in real time. ■ Photoelectric Effect Animate the phenomenon of electrons being emitted when light is shone on a metal. By changing the frequency, light intensity, and work function, you can experience the relationship between E = hf, Kₘₐₓ = hf − W, and threshold frequency f₀ = W/h in a graph. 【Features】 • Real-time parameter adjustment for all simulations • Real-time display of physical formulas and values • Dark mode / Light mode support • Japanese / English support • Android smartphone / tablet support 【Pri
Review coverage
AppRill has captured 0 reviews for this app. This is a collected sample, separate from the store rating count. Latest review capture: Not captured yet.
Recent captured chart positions
No chart positions have been captured for this app yet.
Chart position, rating count and review coverage do not establish downloads, revenue or profit. Understand the differences.